Adding upstream version 3.8.1.upstream/3.8.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1046 insertions, 0 deletions

diff --git a/rules/regexp/headers.lua b/rules/regexp/headers.lua
new file mode 100644
index 0000000..0624997
--- /dev/null
+++ b/rules/regexp/headers.lua
@@ -0,0 +1,1046 @@
+-- Actually these regular expressions were obtained from SpamAssassin project, so they are licensed by apache license:
+--
+-- Licensed to the Apache Software Foundation (ASF) under one or more
+-- contributor license agreements.  See the NOTICE file distributed with
+-- this work for additional information regarding copyright ownership.
+-- The ASF licenses this file to you under the Apache License, Version 2.0
+-- (the "License"); you may not use this file except in compliance with
+-- the License.  You may obtain a copy of the License at:
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+--
+-- Definitions of header regexps
+
+local reconf = config['regexp']
+
+-- Subject needs encoding
+-- Define encodings types
+local subject_encoded_b64 = 'Subject=/=\\?\\S+\\?B\\?/iX'
+local subject_encoded_qp = 'Subject=/=\\?\\S+\\?Q\\?/iX'
+-- Define whether subject must be encoded (contains non-7bit characters)
+local subject_needs_mime = 'Subject=/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f-\\xff]/X'
+-- Final rule
+reconf['SUBJECT_NEEDS_ENCODING'] = {
+  re = string.format('!(%s) & !(%s) & (%s)', subject_encoded_b64, subject_encoded_qp, subject_needs_mime),
+  score = 1.0,
+  mime_only = true,
+  description = 'Subject needs encoding',
+  group = 'headers'
+}
+
+local from_encoded_b64 = 'From=/=\\?\\S+\\?B\\?/iX'
+local from_encoded_qp = 'From=/=\\?\\S+\\?Q\\?/iX'
+local raw_from_needs_mime = 'From=/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f-\\xff]/X'
+reconf['FROM_NEEDS_ENCODING'] = {
+  re = string.format('!(%s) & !(%s) & (%s)', from_encoded_b64, from_encoded_qp, raw_from_needs_mime),
+  score = 1.0,
+  mime_only = true,
+  description = 'From header needs encoding',
+  group = 'headers'
+}
+
+local to_encoded_b64 = 'To=/=\\?\\S+\\?B\\?/iX'
+local to_encoded_qp = 'To=/=\\?\\S+\\?Q\\?/iX'
+local raw_to_needs_mime = 'To=/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f-\\xff]/X'
+reconf['TO_NEEDS_ENCODING'] = {
+  re = string.format('!(%s) & !(%s) & (%s)', to_encoded_b64, to_encoded_qp, raw_to_needs_mime),
+  score = 1.0,
+  mime_only = true,
+  description = 'To header needs encoding',
+  group = 'headers'
+}
+
+-- Detects that there is no space in From header (e.g. Some Name<some@host>)
+reconf['R_NO_SPACE_IN_FROM'] = {
+  re = 'From=/\\S<[-\\w\\.]+\\@[-\\w\\.]+>/X',
+  score = 1.0,
+  mime_only = true,
+  description = 'No space in From header',
+  group = 'headers'
+}
+
+reconf['TO_WRAPPED_IN_SPACES'] = {
+  re = [[To=/<\s[-.\w]+\@[-.\w]+\s>/X]],
+  score = 2.0,
+  mime_only = true,
+  description = 'To address is wrapped in spaces inside angle brackets (e.g. display-name < local-part@domain >)',
+  group = 'headers'
+}
+
+-- Detects missing Subject header
+reconf['MISSING_SUBJECT'] = {
+  re = '!raw_header_exists(Subject)',
+  score = 2.0,
+  mime_only = true,
+  description = 'Subject header is missing',
+  group = 'headers'
+}
+
+rspamd_config.EMPTY_SUBJECT = {
+  score = 1.0,
+  mime_only = true,
+  description = 'Subject header is empty',
+  group = 'headers',
+  callback = function(task)
+    local hdr = task:get_header('Subject')
+    if hdr and #hdr == 0 then
+      return true
+    end
+    return false
+  end
+}
+
+-- Detects missing To header
+reconf['MISSING_TO'] = {
+  re = '!raw_header_exists(To)',
+  score = 2.0,
+  description = 'To header is missing',
+  group = 'headers',
+  mime_only = true,
+}
+
+-- Detects undisclosed recipients
+reconf['R_UNDISC_RCPT'] = {
+  -- match:
+  -- To: undisclosed-recipients:;
+  -- To: Undisclosed recipients:;
+  -- To: undisclosed-recipients: ;
+  -- To: <Undisclosed-Recipient:;>
+  -- To: <"Undisclosed-Recipient:;">
+  -- To: "undisclosed-recipients (utajeni adresati)": ;
+  -- To: Undisclosed recipients:
+  -- but do not match:
+  -- Undisclosed Recipient <user@example.org>
+  re = [[To=/^<?"?undisclosed[- ]recipients?\b.*:/i{header}]],
+  score = 3.0,
+  description = 'Recipients are absent or undisclosed',
+  group = 'headers',
+  mime_only = true,
+}
+
+-- Detects missing Message-ID
+local has_mid = 'header_exists(Message-Id)'
+reconf['MISSING_MID'] = {
+  re = '!header_exists(Message-Id)',
+  score = 2.5,
+  description = 'Message-ID header is missing',
+  group = 'headers',
+  mime_only = true,
+}
+
+-- Received seems to be fake
+reconf['R_RCVD_SPAMBOTS'] = {
+  re = 'Received=/^from \\[\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\] by [-.\\w+]{5,255}; [SMTWF][a-z][a-z],' ..
+      ' [\\s\\d]?\\d [JFMAJSOND][a-z][a-z] \\d{4} \\d{2}:\\d{2}:\\d{2} [-+]\\d{4}$/mH',
+  score = 3.0,
+  description = 'Spambots signatures in received headers',
+  group = 'headers',
+  mime_only = true,
+}
+
+-- Charset is missing in message
+reconf['R_MISSING_CHARSET'] = {
+  re = string.format('!is_empty_body() & content_type_is_type(text) & content_type_is_subtype(plain) & !content_type_has_param(charset) & !%s',
+      'compare_transfer_encoding(7bit)'),
+  score = 0.5,
+  description = 'Charset header is missing',
+  group = 'headers',
+  mime_only = true,
+}
+
+-- Find forged Outlook MUA
+-- Yahoo groups messages
+local yahoo_bulk = 'Received=/from \\[\\S+\\] by \\S+\\.(?:groups|scd|dcn)\\.yahoo\\.com with NNFMP/H'
+-- Outlook MUA
+local outlook_mua = 'X-Mailer=/^Microsoft Outlook\\b/H'
+local any_outlook_mua = 'X-Mailer=/^Microsoft Outlook\\b/H'
+reconf['FORGED_OUTLOOK_HTML'] = {
+  re = string.format('!%s & %s & %s', yahoo_bulk, outlook_mua, 'has_only_html_part()'),
+  score = 5.0,
+  description = 'Forged Outlook HTML signature',
+  group = 'headers',
+  mime_only = true,
+}
+
+-- Recipients seems to be likely with each other (only works when recipients count is more than 5 recipients)
+reconf['SUSPICIOUS_RECIPS'] = {
+  re = 'compare_recipients_distance(0.65)',
+  score = 1.5,
+  description = 'Recipients seems to be autogenerated (works if recipients count is more than 5)',
+  group = 'headers',
+  mime_only = true,
+}
+
+-- Recipients list seems to be sorted
+reconf['SORTED_RECIPS'] = {
+  re = 'is_recipients_sorted()',
+  score = 3.5,
+  description = 'Recipients list seems to be sorted',
+  group = 'headers',
+  mime_only = true,
+}
+
+-- Spam string at the end of message to make statistics faults
+reconf['TRACKER_ID'] = {
+  re = '/^[a-z0-9]{6,24}[-_a-z0-9]{12,36}[a-z0-9]{6,24}\\s*\\z/isPr',
+  score = 3.84,
+  description = 'Spam string at the end of message to make statistics fault',
+  group = 'headers',
+  mime_only = true,
+}
+
+-- From contains only 7bit characters (parsed headers are used)
+local from_needs_mime = 'From=/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f-\\xff]/Hr'
+-- From that contains encoded characters while base 64 is not needed as all symbols are 7bit
+reconf['FROM_EXCESS_BASE64'] = {
+  re = string.format('%s & !%s', from_encoded_b64, from_needs_mime),
+  score = 1.5,
+  description = 'From header is unnecessarily encoded in base64',
+  group = 'excessb64',
+  mime_only = true,
+}
+
+-- From that contains encoded characters while quoted-printable is not needed as all symbols are 7bit
+reconf['FROM_EXCESS_QP'] = {
+  re = string.format('%s & !%s', from_encoded_qp, from_needs_mime),
+  score = 1.2,
+  description = 'From header is unnecessarily encoded in quoted-printable',
+  group = 'excessqp'
+}
+
+-- To contains only 7bit characters (parsed headers are used)
+local to_needs_mime = 'To=/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f-\\xff]/Hr'
+-- To that contains encoded characters while base 64 is not needed as all symbols are 7bit
+reconf['TO_EXCESS_BASE64'] = {
+  re = string.format('%s & !%s', to_encoded_b64, to_needs_mime),
+  score = 1.5,
+  description = 'To header is unnecessarily encoded in base64',
+  group = 'excessb64'
+}
+
+-- To that contains encoded characters while quoted-printable is not needed as all symbols are 7bit
+-- Final rule
+reconf['TO_EXCESS_QP'] = {
+  re = string.format('%s & !%s', to_encoded_qp, to_needs_mime),
+  score = 1.2,
+  description = 'To header is unnecessarily encoded in quoted-printable',
+  group = 'excessqp'
+}
+
+-- Reply-To that contains encoded characters while base 64 is not needed as all symbols are 7bit
+-- Regexp that checks that Reply-To header is encoded with base64 (search in raw headers)
+local replyto_encoded_b64 = 'Reply-To=/\\=\\?\\S+\\?B\\?/iX'
+-- Reply-To contains only 7bit characters (parsed headers are used)
+local replyto_needs_mime = 'Reply-To=/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f-\\xff]/Hr'
+-- Final rule
+reconf['REPLYTO_EXCESS_BASE64'] = {
+  re = string.format('%s & !%s', replyto_encoded_b64, replyto_needs_mime),
+  score = 1.5,
+  description = 'Reply-To header is unnecessarily encoded in base64',
+  group = 'excessb64'
+}
+
+-- Reply-To that contains encoded characters while quoted-printable is not needed as all symbols are 7bit
+-- Regexp that checks that Reply-To header is encoded with quoted-printable (search in raw headers)
+local replyto_encoded_qp = 'Reply-To=/\\=\\?\\S+\\?Q\\?/iX'
+-- Final rule
+reconf['REPLYTO_EXCESS_QP'] = {
+  re = string.format('%s & !%s', replyto_encoded_qp, replyto_needs_mime),
+  score = 1.2,
+  description = 'Reply-To header is unnecessarily encoded in quoted-printable',
+  group = 'excessqp'
+}
+
+-- Cc that contains encoded characters while base 64 is not needed as all symbols are 7bit
+-- Regexp that checks that Cc header is encoded with base64 (search in raw headers)
+local cc_encoded_b64 = 'Cc=/\\=\\?\\S+\\?B\\?/iX'
+-- Co contains only 7bit characters (parsed headers are used)
+local cc_needs_mime = 'Cc=/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f-\\xff]/Hr'
+-- Final rule
+reconf['CC_EXCESS_BASE64'] = {
+  re = string.format('%s & !%s', cc_encoded_b64, cc_needs_mime),
+  score = 1.5,
+  description = 'Cc header is unnecessarily encoded in base64',
+  group = 'excessb64'
+}
+
+-- Cc that contains encoded characters while quoted-printable is not needed as all symbols are 7bit
+-- Regexp that checks that Cc header is encoded with quoted-printable (search in raw headers)
+local cc_encoded_qp = 'Cc=/\\=\\?\\S+\\?Q\\?/iX'
+-- Final rule
+reconf['CC_EXCESS_QP'] = {
+  re = string.format('%s & !%s', cc_encoded_qp, cc_needs_mime),
+  score = 1.2,
+  description = 'Cc header is unnecessarily encoded in quoted-printable',
+  group = 'excessqp'
+}
+
+local subj_encoded_b64 = 'Subject=/\\=\\?\\S+\\?B\\?/iX'
+local subj_needs_mime = 'Subject=/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f-\\xff]/Hr'
+reconf['SUBJ_EXCESS_BASE64'] = {
+  re = string.format('%s & !%s', subj_encoded_b64, subj_needs_mime),
+  score = 1.5,
+  description = 'Subject header is unnecessarily encoded in base64',
+  group = 'excessb64'
+}
+
+local subj_encoded_qp = 'Subject=/\\=\\?\\S+\\?Q\\?/iX'
+reconf['SUBJ_EXCESS_QP'] = {
+  re = string.format('%s & !%s', subj_encoded_qp, subj_needs_mime),
+  score = 1.2,
+  description = 'Subject header is unnecessarily encoded in quoted-printable',
+  group = 'excessqp'
+}
+
+-- Detect forged outlook headers
+-- OE X-Mailer header
+local oe_mua = 'X-Mailer=/\\bOutlook Express [456]\\./H'
+-- OE Message ID format
+local oe_msgid_1 = 'Message-Id=/^<?[A-Za-z0-9-]{7}[A-Za-z0-9]{20}\\@hotmail\\.com>?$/mH'
+local oe_msgid_2 = 'Message-Id=/^<?(?:[0-9a-f]{8}|[0-9a-f]{12})\\$[0-9a-f]{8}\\$[0-9a-f]{8}\\@\\S+>?$/H'
+-- EZLM remail of message
+local lyris_ezml_remailer = 'List-Unsubscribe=/<mailto:(?:leave-\\S+|\\S+-unsubscribe)\\@\\S+>$/H'
+-- Header of wacky sendmail
+local wacky_sendmail_version = 'Received=/\\/CWT\\/DCE\\)/H'
+-- Iplanet received header
+local iplanet_messaging_server = 'Received=/iPlanet Messaging Server/H'
+-- Hotmail message id
+local hotmail_baydav_msgid = 'Message-Id=/^<?BAY\\d+-DAV\\d+[A-Z0-9]{25}\\@phx\\.gbl?>$/H'
+-- Sympatico message id
+local sympatico_msgid = 'Message-Id=/^<?BAYC\\d+-PASMTP\\d+[A-Z0-9]{25}\\@CEZ\\.ICE>?$/H'
+-- Mailman message id
+-- https://bazaar.launchpad.net/~mailman-coders/mailman/2.1/view/head:/Mailman/Utils.py#L811
+local mailman_msgid = [[Message-ID=/^<mailman\.\d+\.\d+\.\d+\.[-+.:=\w]+@[-a-zA-Z\d.]+>$/H]]
+-- Message id seems to be forged
+local unusable_msgid = string.format('(%s | %s | %s | %s | %s | %s)',
+    lyris_ezml_remailer, wacky_sendmail_version,
+    iplanet_messaging_server, hotmail_baydav_msgid, sympatico_msgid, mailman_msgid)
+-- Outlook express data seems to be forged
+local forged_oe = string.format('(%s & !%s & !%s & !%s)', oe_mua, oe_msgid_1, oe_msgid_2, unusable_msgid)
+-- Outlook specific headers
+local outlook_dollars_mua = 'X-Mailer=/^Microsoft Outlook(?: 8| CWS, Build 9|, Build 10)\\./H'
+local outlook_dollars_other = 'Message-Id=/^<?\\!\\~\\!>?/H'
+local vista_msgid = 'Message-Id=/^<?[A-F\\d]{32}\\@\\S+>?$/H'
+local ims_msgid = 'Message-Id=/^<?[A-F\\d]{36,40}\\@\\S+>?$/H'
+-- Forged outlook headers
+local forged_outlook_dollars = string.format('(%s & !%s & !%s & !%s & !%s & !%s)',
+    outlook_dollars_mua, oe_msgid_2, outlook_dollars_other, vista_msgid, ims_msgid, unusable_msgid)
+-- Outlook versions that should be excluded from summary rule
+local fmo_excl_o3416 = 'X-Mailer=/^Microsoft Outlook, Build 10.0.3416$/H'
+local fmo_excl_oe3790 = 'X-Mailer=/^Microsoft Outlook Express 6.00.3790.3959$/H'
+-- Summary rule for forged outlook
+reconf['FORGED_MUA_OUTLOOK'] = {
+  re = string.format('(%s | %s) & !%s & !%s & !%s',
+      forged_oe, forged_outlook_dollars, fmo_excl_o3416, fmo_excl_oe3790, vista_msgid),
+  score = 3.0,
+  description = 'Forged Outlook MUA',
+  group = 'mua'
+}
+
+-- HTML outlook signs
+local mime_html = 'content_type_is_type(text) & content_type_is_subtype(/.?html/)'
+local tag_exists_html = 'has_html_tag(html)'
+local tag_exists_head = 'has_html_tag(head)'
+local tag_exists_meta = 'has_html_tag(meta)'
+local tag_exists_body = 'has_html_tag(body)'
+reconf['FORGED_OUTLOOK_TAGS'] = {
+  re = string.format('!%s & %s & %s & !(%s & %s & %s & %s)',
+      yahoo_bulk, any_outlook_mua, mime_html, tag_exists_html, tag_exists_head,
+      tag_exists_meta, tag_exists_body),
+  score = 2.1,
+  description = "Message pretends to be send from Outlook but has 'strange' tags",
+  group = 'headers'
+}
+
+-- Forged OE/MSO boundary
+reconf['SUSPICIOUS_BOUNDARY'] = {
+  re = 'Content-Type=/^\\s*multipart.+boundary="----=_NextPart_000_[A-Z\\d]{4}_(00EBFFA4|0102FFA4|32C6FFA4|3302FFA4)\\.[A-Z\\d]{8}"[\\r\\n]*$/siX',
+  score = 5.0,
+  description = 'Suspicious boundary in Content-Type header',
+  group = 'mua'
+}
+-- Forged OE/MSO boundary
+reconf['SUSPICIOUS_BOUNDARY2'] = {
+  re = 'Content-Type=/^\\s*multipart.+boundary="----=_NextPart_000_[A-Z\\d]{4}_(01C6527E)\\.[A-Z\\d]{8}"[\\r\\n]*$/siX',
+  score = 4.0,
+  description = 'Suspicious boundary in Content-Type header',
+  group = 'mua'
+}
+-- Forged OE/MSO boundary
+reconf['SUSPICIOUS_BOUNDARY3'] = {
+  re = 'Content-Type=/^\\s*multipart.+boundary="-----000-00\\d\\d-01C[\\dA-F]{5}-[\\dA-F]{8}"[\\r\\n]*$/siX',
+  score = 3.0,
+  description = 'Suspicious boundary in Content-Type header',
+  group = 'mua'
+}
+-- Forged OE/MSO boundary
+local suspicious_boundary_01C4 = 'Content-Type=/^\\s*multipart.+boundary="----=_NextPart_000_[A-Z\\d]{4}_01C4[\\dA-F]{4}\\.[A-Z\\d]{8}"[\\r\\n]*$/siX'
+local suspicious_boundary_01C4_date = 'Date=/^\\s*\\w\\w\\w,\\s+\\d+\\s+\\w\\w\\w 20(0[56789]|1\\d)/'
+reconf['SUSPICIOUS_BOUNDARY4'] = {
+  re = string.format('(%s) & (%s)', suspicious_boundary_01C4, suspicious_boundary_01C4_date),
+  score = 4.0,
+  description = 'Suspicious boundary in Content-Type header',
+  group = 'mua'
+}
+
+-- Detect forged The Bat! headers
+-- The Bat! X-Mailer header
+local thebat_mua_any = 'X-Mailer=/^\\s*The Bat!/H'
+-- The Bat! common Message-ID template
+local thebat_msgid_common = 'Message-ID=/^<?\\d+\\.\\d+\\@\\S+>?$/mH'
+-- Correct The Bat! Message-ID template
+local thebat_msgid = 'Message-ID=/^<?\\d+\\.(19[789]\\d|20\\d\\d)(0\\d|1[012])([012]\\d|3[01])([0-5]\\d)([0-5]\\d)([0-5]\\d)\\@\\S+>?/mH'
+-- Summary rule for forged The Bat! Message-ID header
+reconf['FORGED_MUA_THEBAT_MSGID'] = {
+  re = string.format('(%s) & !(%s) & (%s) & !(%s)', thebat_mua_any, thebat_msgid, thebat_msgid_common, unusable_msgid),
+  score = 4.0,
+  description = 'Message pretends to be send from The Bat! but has forged Message-ID',
+  group = 'mua'
+}
+-- Summary rule for forged The Bat! Message-ID header with unknown template
+reconf['FORGED_MUA_THEBAT_MSGID_UNKNOWN'] = {
+  re = string.format('(%s) & !(%s) & !(%s) & !(%s)', thebat_mua_any, thebat_msgid, thebat_msgid_common, unusable_msgid),
+  score = 3.0,
+  description = 'Message pretends to be send from The Bat! but has forged Message-ID',
+  group = 'mua'
+}
+
+-- Detect forged KMail headers
+-- KMail User-Agent header
+local kmail_mua = 'User-Agent=/^\\s*KMail\\/1\\.\\d+\\.\\d+/H'
+-- KMail common Message-ID template
+local kmail_msgid_common = 'Message-Id=/^<?\\s*\\d+\\.\\d+\\.\\S+\\@\\S+>?$/mH'
+-- Summary rule for forged KMail Message-ID header with unknown template
+reconf['FORGED_MUA_KMAIL_MSGID_UNKNOWN'] = {
+  re = string.format('(%s) & !(%s) & !(%s)', kmail_mua, kmail_msgid_common, unusable_msgid),
+  score = 2.5,
+  description = 'Message pretends to be send from KMail but has forged Message-ID',
+  group = 'mua'
+}
+
+-- Detect forged Opera Mail headers
+-- Opera Mail User-Agent header
+local opera1x_mua = 'User-Agent=/^\\s*Opera Mail\\/1[01]\\.\\d+ /H'
+-- Opera Mail Message-ID template
+local opera1x_msgid = 'Message-ID=/^<?op\\.[a-z\\d]{14}\\@\\S+>?$/H'
+-- Rule for forged Opera Mail Message-ID header
+reconf['FORGED_MUA_OPERA_MSGID'] = {
+  re = string.format('(%s) & !(%s) & !(%s)', opera1x_mua, opera1x_msgid, unusable_msgid),
+  score = 4.0,
+  description = 'Message pretends to be send from Opera Mail but has forged Message-ID',
+  group = 'mua'
+}
+
+-- Detect forged Mozilla Mail/Thunderbird/Seamonkey/Postbox headers
+-- Mozilla based X-Mailer
+local user_agent_mozilla5 = 'User-Agent=/^\\s*Mozilla\\/5\\.0/H'
+local user_agent_thunderbird = 'User-Agent=/^\\s*(Thunderbird|Mozilla Thunderbird|Mozilla\\/.*Gecko\\/.*(Thunderbird|Betterbird|Icedove)\\/)/H'
+local user_agent_seamonkey = 'User-Agent=/^\\s*Mozilla\\/5\\.0\\s.+\\sSeaMonkey\\/\\d+\\.\\d+/H'
+local user_agent_postbox = [[User-Agent=/^\s*Mozilla\/5\.0\s\([^)]+\)\sGecko\/\d+\sPostboxApp\/\d+(?:\.\d+){2,3}$/H]]
+local user_agent_mozilla = string.format('(%s) & !(%s) & !(%s) & !(%s)', user_agent_mozilla5, user_agent_thunderbird,
+    user_agent_seamonkey, user_agent_postbox)
+-- Mozilla based common Message-ID template
+local mozilla_msgid_common = 'Message-ID=/^\\s*<[\\dA-F]{8}\\.\\d{1,7}\\@([^>\\.]+\\.)+[^>\\.]+>$/H'
+local mozilla_msgid_common_sec = 'Message-ID=/^\\s*<[\\da-f]{8}-([\\da-f]{4}-){3}[\\da-f]{12}\\@([^>\\.]+\\.)+[^>\\.]+>$/H'
+local mozilla_msgid = 'Message-ID=/^\\s*<(3[3-9A-F]|[4-9A-F][\\dA-F])[\\dA-F]{6}\\.(\\d0){1,4}\\d\\@([^>\\.]+\\.)+[^>\\.]+>$/H'
+-- Summary rule for forged Mozilla Mail Message-ID header
+reconf['FORGED_MUA_MOZILLA_MAIL_MSGID'] = {
+  re = string.format('(%s) & (%s) & !(%s) & !(%s)', user_agent_mozilla, mozilla_msgid_common, mozilla_msgid,
+      unusable_msgid),
+  score = 4.0,
+  description = 'Message pretends to be send from Mozilla Mail but has forged Message-ID',
+  group = 'mua'
+}
+reconf['FORGED_MUA_MOZILLA_MAIL_MSGID_UNKNOWN'] = {
+  re = string.format('(%s) & !(%s) & !(%s) & !(%s)', user_agent_mozilla, mozilla_msgid_common, mozilla_msgid,
+      unusable_msgid),
+  score = 2.5,
+  description = 'Message pretends to be send from Mozilla Mail but has forged Message-ID',
+  group = 'mua'
+}
+
+-- Summary rule for forged Thunderbird Message-ID header
+reconf['FORGED_MUA_THUNDERBIRD_MSGID'] = {
+  re = string.format('(%s) & (%s) & !(%s) & !(%s)', user_agent_thunderbird, mozilla_msgid_common, mozilla_msgid,
+      unusable_msgid),
+  score = 4.0,
+  description = 'Forged mail pretending to be from Mozilla Thunderbird but has forged Message-ID',
+  group = 'mua'
+}
+reconf['FORGED_MUA_THUNDERBIRD_MSGID_UNKNOWN'] = {
+  re = string.format('(%s) & !((%s) | (%s)) & !(%s) & !(%s)', user_agent_thunderbird, mozilla_msgid_common,
+      mozilla_msgid_common_sec, mozilla_msgid, unusable_msgid),
+  score = 2.5,
+  description = 'Forged mail pretending to be from Mozilla Thunderbird but has forged Message-ID',
+  group = 'mua'
+}
+-- Summary rule for forged Seamonkey Message-ID header
+reconf['FORGED_MUA_SEAMONKEY_MSGID'] = {
+  re = string.format('(%s) & (%s) & !(%s) & !(%s)', user_agent_seamonkey, mozilla_msgid_common, mozilla_msgid,
+      unusable_msgid),
+  score = 4.0,
+  description = 'Forged mail pretending to be from Mozilla Seamonkey but has forged Message-ID',
+  group = 'mua'
+}
+reconf['FORGED_MUA_SEAMONKEY_MSGID_UNKNOWN'] = {
+  re = string.format('(%s) & !((%s) | (%s)) & !(%s) & !(%s)', user_agent_seamonkey, mozilla_msgid_common,
+      mozilla_msgid_common_sec, mozilla_msgid, unusable_msgid),
+  score = 2.5,
+  description = 'Forged mail pretending to be from Mozilla Seamonkey but has forged Message-ID',
+  group = 'mua'
+}
+-- Summary rule for forged Postbox Message-ID header
+reconf['FORGED_MUA_POSTBOX_MSGID'] = {
+  re = string.format('(%s) & (%s) & !(%s) & !(%s)', user_agent_postbox, mozilla_msgid_common, mozilla_msgid,
+      unusable_msgid),
+  score = 4.0,
+  description = 'Forged mail pretending to be from Postbox but has forged Message-ID',
+  group = 'mua'
+}
+reconf['FORGED_MUA_POSTBOX_MSGID_UNKNOWN'] = {
+  re = string.format('(%s) & !((%s) | (%s)) & !(%s) & !(%s)', user_agent_postbox, mozilla_msgid_common,
+      mozilla_msgid_common_sec, mozilla_msgid, unusable_msgid),
+  score = 2.5,
+  description = 'Forged mail pretending to be from Postbox but has forged Message-ID',
+  group = 'mua'
+}
+
+-- Message id validity
+local sane_msgid = 'Message-Id=/^<?[^<>\\\\ \\t\\n\\r\\x0b\\x80-\\xff]+\\@[^<>\\\\ \\t\\n\\r\\x0b\\x80-\\xff]+>?\\s*$/H'
+local msgid_comment = 'Message-Id=/\\(.*\\)/H'
+reconf['INVALID_MSGID'] = {
+  re = string.format('(%s) & !((%s) | (%s))', has_mid, sane_msgid, msgid_comment),
+  score = 1.7,
+  description = 'Message-ID header is incorrect',
+  group = 'headers'
+}
+
+-- Only Content-Type header without other MIME headers
+local cd = 'header_exists(Content-Disposition)'
+local cte = 'header_exists(Content-Transfer-Encoding)'
+local ct = 'header_exists(Content-Type)'
+local mime_version = 'raw_header_exists(MIME-Version)'
+local ct_text_plain = 'content_type_is_type(text) & content_type_is_subtype(plain)'
+reconf['MIME_HEADER_CTYPE_ONLY'] = {
+  re = string.format('!(%s) & !(%s) & (%s) & !(%s) & !(%s)', cd, cte, ct, mime_version, ct_text_plain),
+  score = 2.0,
+  description = 'Only Content-Type header without other MIME headers',
+  group = 'headers'
+}
+
+-- Forged Exchange messages
+local msgid_dollars_ok = 'Message-Id=/[0-9a-f]{4,}\\$[0-9a-f]{4,}\\$[0-9a-f]{4,}\\@\\S+/H'
+local mimeole_ms = 'X-MimeOLE=/^Produced By Microsoft MimeOLE/H'
+local rcvd_with_exchange = 'Received=/with Microsoft Exchange Server/H'
+reconf['RATWARE_MS_HASH'] = {
+  re = string.format('(%s) & !(%s) & !(%s)', msgid_dollars_ok, mimeole_ms, rcvd_with_exchange),
+  score = 2.0,
+  description = 'Forged Exchange messages',
+  group = 'headers'
+}
+
+-- Reply-type in content-type
+reconf['STOX_REPLY_TYPE'] = {
+  re = 'Content-Type=/text\\/plain; .* reply-type=original/H',
+  score = 1.0,
+  description = 'Reply-type in Content-Type header',
+  group = 'headers'
+}
+
+-- Forged yahoo msgid
+local at_yahoo_msgid = 'Message-Id=/\\@yahoo\\.com\\b/iH'
+local from_yahoo_com = 'From=/\\@yahoo\\.com\\b/iH'
+reconf['FORGED_MSGID_YAHOO'] = {
+  re = string.format('(%s) & !(%s)', at_yahoo_msgid, from_yahoo_com),
+  score = 2.0,
+  description = 'Forged Yahoo Message-ID header',
+  group = 'headers'
+}
+
+-- Forged The Bat! MUA headers
+local thebat_mua_v1 = 'X-Mailer=/^The Bat! \\(v1\\./H'
+local ctype_has_boundary = 'Content-Type=/boundary/iH'
+local bat_boundary = 'Content-Type=/boundary=\\"?-{10}/H'
+local mailman_21 = 'X-Mailman-Version=/\\d/H'
+reconf['FORGED_MUA_THEBAT_BOUN'] = {
+  re = string.format('(%s) & (%s) & !(%s) & !(%s)', thebat_mua_v1, ctype_has_boundary, bat_boundary, mailman_21),
+  score = 2.0,
+  description = 'Forged The Bat! MUA headers',
+  group = 'headers'
+}
+
+-- Detect Mail.Ru web-mail
+local xm_mail_ru_mailer_1_0 = 'X-Mailer=/^Mail\\.Ru Mailer 1\\.0$/H'
+local rcvd_e_mail_ru = 'Received=/^(?:from \\[\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\] )?by e\\.mail\\.ru with HTTP;/mH'
+reconf['MAIL_RU_MAILER'] = {
+  re = string.format('(%s) & (%s)', xm_mail_ru_mailer_1_0, rcvd_e_mail_ru),
+  score = 0.0,
+  description = 'Sent with Mail.Ru webmail',
+  group = 'headers'
+}
+
+-- Detect yandex.ru web-mail
+local xm_yandex_ru_mailer_5_0 = 'X-Mailer=/^Yamail \\[ http:\\/\\/yandex\\.ru \\] 5\\.0$/H'
+local rcvd_web_yandex_ru = 'Received=/^by web\\d{1,2}[a-z]\\.yandex\\.ru with HTTP;/mH'
+reconf['YANDEX_RU_MAILER'] = {
+  re = string.format('(%s) & (%s)', xm_yandex_ru_mailer_5_0, rcvd_web_yandex_ru),
+  score = 0.0,
+  description = 'Sent with Yandex webmail',
+  group = 'headers'
+}
+
+-- Detect 1C v8.2 and v8.3 mailers
+reconf['MAILER_1C_8'] = {
+  re = 'X-Mailer=/^1C:Enterprise 8\\.[23]$/H',
+  score = 0.0,
+  description = 'Sent with 1C:Enterprise 8',
+  group = 'headers'
+}
+
+-- Detect rogue 'strongmail' MTA with IPv4 and '(-)' in Received line
+reconf['STRONGMAIL'] = {
+  re = [[Received=/^from\s+strongmail\s+\(\[\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\]\) by \S+ \(-\); /mH]],
+  score = 6.0,
+  description = 'Sent via rogue "strongmail" MTA',
+  group = 'headers'
+}
+
+-- Two received headers with ip addresses
+local double_ip_spam_1 = 'Received=/from \\[\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\] by \\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3} with/H'
+local double_ip_spam_2 = 'Received=/from\\s+\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\s+by\\s+\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3};/H'
+reconf['RCVD_DOUBLE_IP_SPAM'] = {
+  re = string.format('(%s) | (%s)', double_ip_spam_1, double_ip_spam_2),
+  score = 2.0,
+  description = 'Has two Received headers containing bare IP addresses',
+  group = 'headers'
+}
+
+-- Quoted reply-to from yahoo (seems to be forged)
+local repto_quote = 'Reply-To=/\\".*\\"\\s*\\</H'
+reconf['REPTO_QUOTE_YAHOO'] = {
+  re = string.format('(%s) & ((%s) | (%s))', repto_quote, from_yahoo_com, at_yahoo_msgid),
+  score = 2.0,
+  description = 'Quoted Reply-To header from Yahoo (seems to be forged)',
+  group = 'headers'
+}
+
+reconf['FAKE_REPLY'] = {
+  re = [[Subject=/^re:/i{header} & !(header_exists(In-Reply-To) | header_exists(References))]],
+  description = 'Fake reply',
+  score = 1.0,
+  group = 'headers'
+}
+
+-- Mime-OLE is needed but absent (e.g. fake Outlook or fake Exchange)
+local has_msmail_pri = 'header_exists(X-MSMail-Priority)'
+local has_mimeole = 'header_exists(X-MimeOLE)'
+local has_squirrelmail_in_mailer = 'X-Mailer=/SquirrelMail\\b/H'
+local has_office_version_in_mailer = [[X-Mailer=/^Microsoft (?:Office )?Outlook [12]\d\.0/]]
+local has_x_android_message_id = 'header_exists(X-Android-Message-Id)'
+reconf['MISSING_MIMEOLE'] = {
+  re = string.format('(%s) & !(%s) & !(%s) & !(%s) & !(%s)',
+      has_msmail_pri,
+      has_mimeole,
+      has_squirrelmail_in_mailer,
+      has_office_version_in_mailer,
+      has_x_android_message_id),
+  score = 2.0,
+  description = 'Mime-OLE is needed but absent (e.g. fake Outlook or fake Exchange)',
+  group = 'headers'
+}
+
+-- Empty delimiters between header names and header values
+local function gen_check_header_delimiter_empty(header_name)
+  return function(task)
+    for _, rh in ipairs(task:get_header_full(header_name) or {}) do
+      if rh['empty_separator'] then
+        return true
+      end
+    end
+    return false
+  end
+end
+reconf['HEADER_FROM_EMPTY_DELIMITER'] = {
+  re = string.format('(%s)', 'lua:check_from_delim_empty'),
+  score = 1.0,
+  description = 'From header has no delimiter between header name and header value',
+  group = 'headers',
+  functions = {
+    check_from_delim_empty = gen_check_header_delimiter_empty('From')
+  }
+}
+reconf['HEADER_TO_EMPTY_DELIMITER'] = {
+  re = string.format('(%s)', 'lua:check_to_delim_empty'),
+  score = 1.0,
+  description = 'To header has no delimiter between header name and header value',
+  group = 'headers',
+  functions = {
+    check_to_delim_empty = gen_check_header_delimiter_empty('To')
+  }
+}
+reconf['HEADER_CC_EMPTY_DELIMITER'] = {
+  re = string.format('(%s)', 'lua:check_cc_delim_empty'),
+  score = 1.0,
+  description = 'Cc header has no delimiter between header name and header value',
+  group = 'headers',
+  functions = {
+    check_cc_delim_empty = gen_check_header_delimiter_empty('Cc')
+  }
+}
+reconf['HEADER_REPLYTO_EMPTY_DELIMITER'] = {
+  re = string.format('(%s)', 'lua:check_repto_delim_empty'),
+  score = 1.0,
+  description = 'Reply-To header has no delimiter between header name and header value',
+  group = 'headers',
+  functions = {
+    check_repto_delim_empty = gen_check_header_delimiter_empty('Reply-To')
+  }
+}
+reconf['HEADER_DATE_EMPTY_DELIMITER'] = {
+  re = string.format('(%s)', 'lua:check_date_delim_empty'),
+  score = 1.0,
+  description = 'Date header has no delimiter between header name and header value',
+  group = 'headers',
+  functions = {
+    check_date_delim_empty = gen_check_header_delimiter_empty('Date')
+  }
+}
+
+-- Definitions of received headers regexp
+reconf['RCVD_ILLEGAL_CHARS'] = {
+  re = 'Received=/[\\x80-\\xff]/X',
+  score = 4.0,
+  description = 'Received header has raw illegal character',
+  group = 'headers'
+}
+
+local MAIL_RU_Return_Path = 'Return-path=/^\\s*<.+\\@mail\\.ru>$/iX'
+local MAIL_RU_X_Envelope_From = 'X-Envelope-From=/^\\s*<.+\\@mail\\.ru>$/iX'
+local MAIL_RU_From = 'From=/\\@mail\\.ru>?$/iX'
+local MAIL_RU_Received = 'Received=/from mail\\.ru \\(/mH'
+
+reconf['FAKE_RECEIVED_mail_ru'] = {
+  re = string.format('(%s) & !(((%s) | (%s)) & (%s))',
+      MAIL_RU_Received, MAIL_RU_Return_Path, MAIL_RU_X_Envelope_From, MAIL_RU_From),
+  score = 4.0,
+  description = 'Fake HELO mail.ru in Received header from non-mail.ru sender address',
+  group = 'headers'
+}
+
+local GMAIL_COM_Return_Path = 'Return-path=/^\\s*<.+\\@gmail\\.com>$/iX'
+local GMAIL_COM_X_Envelope_From = 'X-Envelope-From=/^\\s*<.+\\@gmail\\.com>$/iX'
+local GMAIL_COM_From = 'From=/\\@gmail\\.com>?$/iX'
+
+local UKR_NET_Return_Path = 'Return-path=/^\\s*<.+\\@ukr\\.net>$/iX'
+local UKR_NET_X_Envelope_From = 'X-Envelope-From=/^\\s*<.+\\@ukr\\.net>$/iX'
+local UKR_NET_From = 'From=/\\@ukr\\.net>?$/iX'
+
+local RECEIVED_smtp_yandex_ru_1 = 'Received=/from \\[\\d+\\.\\d+\\.\\d+\\.\\d+\\] \\((port=\\d+ )?helo=smtp\\.yandex\\.ru\\)/iX'
+local RECEIVED_smtp_yandex_ru_2 = 'Received=/from \\[UNAVAILABLE\\] \\(\\[\\d+\\.\\d+\\.\\d+\\.\\d+\\]:\\d+ helo=smtp\\.yandex\\.ru\\)/iX'
+local RECEIVED_smtp_yandex_ru_3 = 'Received=/from \\S+ \\(\\[\\d+\\.\\d+\\.\\d+\\.\\d+\\]:\\d+ helo=smtp\\.yandex\\.ru\\)/iX'
+local RECEIVED_smtp_yandex_ru_4 = 'Received=/from \\[\\d+\\.\\d+\\.\\d+\\.\\d+\\] \\(account \\S+ HELO smtp\\.yandex\\.ru\\)/iX'
+local RECEIVED_smtp_yandex_ru_5 = 'Received=/from smtp\\.yandex\\.ru \\(\\[\\d+\\.\\d+\\.\\d+\\.\\d+\\]\\)/iX'
+local RECEIVED_smtp_yandex_ru_6 = 'Received=/from smtp\\.yandex\\.ru \\(\\S+ \\[\\d+\\.\\d+\\.\\d+\\.\\d+\\]\\)/iX'
+local RECEIVED_smtp_yandex_ru_7 = 'Received=/from \\S+ \\(HELO smtp\\.yandex\\.ru\\) \\(\\S+\\@\\d+\\.\\d+\\.\\d+\\.\\d+\\)/iX'
+local RECEIVED_smtp_yandex_ru_8 = 'Received=/from \\S+ \\(HELO smtp\\.yandex\\.ru\\) \\(\\d+\\.\\d+\\.\\d+\\.\\d+\\)/iX'
+local RECEIVED_smtp_yandex_ru_9 = 'Received=/from \\S+ \\(\\[\\d+\\.\\d+\\.\\d+\\.\\d+\\] helo=smtp\\.yandex\\.ru\\)/iX'
+
+reconf['FAKE_RECEIVED_smtp_yandex_ru'] = {
+  re = string.format('(((%s) & ((%s) | (%s))) | ((%s) & ((%s) | (%s))) ' ..
+      ' | ((%s) & ((%s) | (%s)))) & (%s) | (%s) | (%s) | (%s) | (%s) | (%s) | (%s) | (%s) | (%s)',
+      MAIL_RU_From, MAIL_RU_Return_Path, MAIL_RU_X_Envelope_From, GMAIL_COM_From,
+      GMAIL_COM_Return_Path, GMAIL_COM_X_Envelope_From, UKR_NET_From, UKR_NET_Return_Path,
+      UKR_NET_X_Envelope_From, RECEIVED_smtp_yandex_ru_1, RECEIVED_smtp_yandex_ru_2,
+      RECEIVED_smtp_yandex_ru_3, RECEIVED_smtp_yandex_ru_4, RECEIVED_smtp_yandex_ru_5,
+      RECEIVED_smtp_yandex_ru_6, RECEIVED_smtp_yandex_ru_7, RECEIVED_smtp_yandex_ru_8,
+      RECEIVED_smtp_yandex_ru_9),
+  score = 4.0,
+  description = 'Fake smtp.yandex.ru Received header',
+  group = 'headers'
+}
+
+reconf['FORGED_GENERIC_RECEIVED'] = {
+  re = 'Received=/^\\s*(.+\\n)*from \\[\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\] by (([\\w\\d-]+\\.)+[a-zA-Z]{2,6}|\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}); \\w{3}, \\d+ \\w{3} 20\\d\\d \\d\\d\\:\\d\\d\\:\\d\\d [+-]\\d\\d\\d0/X',
+  score = 3.6,
+  description = 'Forged generic Received header',
+  group = 'headers'
+}
+
+reconf['FORGED_GENERIC_RECEIVED2'] = {
+  re = 'Received=/^\\s*(.+\\n)*from \\[\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\] by ([\\w\\d-]+\\.)+[a-z]{2,6} id [\\w\\d]{12}; \\w{3}, \\d+ \\w{3} 20\\d\\d \\d\\d\\:\\d\\d\\:\\d\\d [+-]\\d\\d\\d0/X',
+  score = 3.6,
+  description = 'Forged generic Received header',
+  group = 'headers'
+}
+
+reconf['FORGED_GENERIC_RECEIVED3'] = {
+  re = 'Received=/^\\s*(.+\\n)*by \\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3} with SMTP id [a-zA-Z]{14}\\.\\d{13};[\\r\\n\\s]*\\w{3}, \\d+ \\w{3} 20\\d\\d \\d\\d\\:\\d\\d\\:\\d\\d [+-]\\d\\d\\d0 \\(GMT\\)/X',
+  score = 3.6,
+  description = 'Forged generic Received header',
+  group = 'headers'
+}
+
+reconf['FORGED_GENERIC_RECEIVED4'] = {
+  re = 'Received=/^\\s*(.+\\n)*from localhost by \\S+;\\s+\\w{3}, \\d+ \\w{3} 20\\d\\d \\d\\d\\:\\d\\d\\:\\d\\d [+-]\\d\\d\\d0[\\s\\r\\n]*$/X',
+  score = 3.6,
+  description = 'Forged generic Received header',
+  group = 'headers'
+}
+
+reconf['INVALID_POSTFIX_RECEIVED'] = {
+  re = 'Received=/ \\(Postfix\\) with ESMTP id [A-Z\\d]+([\\s\\r\\n]+for <\\S+?>)?;[\\s\\r\\n]*[A-Z][a-z]{2}, \\d{1,2} [A-Z][a-z]{2} \\d\\d\\d\\d \\d\\d:\\d\\d:\\d\\d [\\+\\-]\\d\\d\\d\\d$/X',
+  score = 3.0,
+  description = 'Invalid Postfix Received header',
+  group = 'headers'
+}
+
+reconf['X_PHP_FORGED_0X'] = {
+  re = "X-PHP-Originating-Script=/^0\\d/X",
+  score = 4.0,
+  description = "X-PHP-Originating-Script header appears forged",
+  group = 'headers'
+}
+
+reconf['GOOGLE_FORWARDING_MID_MISSING'] = {
+  re = "Message-ID=/SMTPIN_ADDED_MISSING\\@mx\\.google\\.com>$/X",
+  score = 2.5,
+  description = "Message was missing Message-ID pre-forwarding",
+  group = 'headers'
+}
+
+reconf['GOOGLE_FORWARDING_MID_BROKEN'] = {
+  re = "Message-ID=/SMTPIN_ADDED_BROKEN\\@mx\\.google\\.com>$/X",
+  score = 1.7,
+  description = "Message had invalid Message-ID pre-forwarding",
+  group = 'headers'
+}
+
+reconf['CTE_CASE'] = {
+  re = 'Content-Transfer-Encoding=/^[78]B/X',
+  description = '[78]Bit .vs. [78]bit',
+  score = 0.5,
+  group = 'headers'
+}
+
+reconf['HAS_INTERSPIRE_SIG'] = {
+  re = string.format('((%s) & (%s) & (%s) & (%s)) | (%s)',
+      'header_exists(X-Mailer-LID)',
+      'header_exists(X-Mailer-RecptId)',
+      'header_exists(X-Mailer-SID)',
+      'header_exists(X-Mailer-Sent-By)',
+      'List-Unsubscribe=/\\/unsubscribe\\.php\\?M=[^&]+&C=[^&]+&L=[^&]+&N=[^>]+>$/Xi'),
+  description = "Has Interspire fingerprint",
+  score = 1.0,
+  group = 'headers'
+}
+
+reconf['CT_EXTRA_SEMI'] = {
+  re = 'Content-Type=/;$/X',
+  description = 'Content-Type header ends with a semi-colon',
+  score = 1.0,
+  group = 'headers'
+}
+
+reconf['SUBJECT_ENDS_EXCLAIM'] = {
+  re = 'Subject=/!\\s*$/H',
+  description = 'Subject ends with an exclamation mark',
+  score = 0.0,
+  group = 'headers'
+}
+
+reconf['SUBJECT_HAS_EXCLAIM'] = {
+  re = string.format('%s & !%s', 'Subject=/!/H', 'Subject=/!\\s*$/H'),
+  description = 'Subject contains an exclamation mark',
+  score = 0.0,
+  group = 'headers'
+}
+
+reconf['SUBJECT_ENDS_QUESTION'] = {
+  re = 'Subject=/\\?\\s*$/Hu',
+  description = 'Subject ends with a question mark',
+  score = 1.0,
+  group = 'headers'
+}
+
+reconf['SUBJECT_HAS_QUESTION'] = {
+  re = string.format('%s & !%s', 'Subject=/\\?/H', 'Subject=/\\?\\s*$/Hu'),
+  description = 'Subject contains a question mark',
+  score = 0.0,
+  group = 'headers'
+}
+
+reconf['SUBJECT_HAS_CURRENCY'] = {
+  re = 'Subject=/\\p{Sc}/Hu',
+  description = 'Subject contains currency',
+  score = 1.0,
+  group = 'headers'
+}
+
+reconf['SUBJECT_ENDS_SPACES'] = {
+  re = 'Subject=/\\s+$/H',
+  description = 'Subject ends with space characters',
+  score = 0.5,
+  group = 'headers'
+}
+
+reconf['HAS_ORG_HEADER'] = {
+  re = string.format('%s || %s', 'header_exists(Organization)', 'header_exists(Organisation)'),
+  description = 'Has Organization header',
+  score = 0.0,
+  group = 'headers'
+}
+
+reconf['X_PHPOS_FAKE'] = {
+  re = 'X-PHP-Originating-Script=/^\\d{7}:/Hi',
+  description = 'Fake X-PHP-Originating-Script header',
+  score = 3.0,
+  group = 'headers'
+}
+
+reconf['HAS_XOIP'] = {
+  re = "header_exists('X-Originating-IP')",
+  description = "Has X-Originating-IP header",
+  score = 0.0,
+  group = 'headers'
+}
+
+reconf['HAS_LIST_UNSUB'] = {
+  re = string.format('%s', 'header_exists(List-Unsubscribe)'),
+  description = 'Has List-Unsubscribe header',
+  score = -0.01,
+  group = 'headers'
+}
+
+reconf['HAS_GUC_PROXY_URI'] = {
+  re = '/\\.googleusercontent\\.com\\/proxy/{url}i',
+  description = 'Has googleusercontent.com proxy URL',
+  score = 1.0,
+  group = 'url'
+}
+
+reconf['HAS_GOOGLE_REDIR'] = {
+  re = '/\\.google\\.([a-z]{2,3}(|\\.[a-z]{2,3})|info|jobs)\\/(amp\\/s\\/|url\\?)/{url}i',
+  description = 'Has google.com/url or alike Google redirection URL',
+  score = 1.0,
+  group = 'url'
+}
+
+reconf['HAS_GOOGLE_FIREBASE_URL'] = {
+  re = '/\\.firebasestorage\\.googleapis\\.com\\//{url}i',
+  description = 'Contains firebasestorage.googleapis.com URL',
+  score = 2.0,
+  group = 'url'
+}
+
+reconf['XM_UA_NO_VERSION'] = {
+  re = string.format('(!%s && !%s) && (%s || %s)',
+      'X-Mailer=/https?:/H',
+      'User-Agent=/https?:/H',
+      'X-Mailer=/^[^0-9]+$/H',
+      'User-Agent=/^[^0-9]+$/H'),
+  description = 'X-Mailer/User-Agent header has no version number',
+  score = 0.01,
+  group = 'experimental'
+}
+
+-- Detects messages missing both X-Mailer and User-Agent header
+local has_ua = 'header_exists(User-Agent)'
+local has_xmailer = 'header_exists(X-Mailer)'
+reconf['MISSING_XM_UA'] = {
+  re = string.format('!%s && !%s', has_xmailer, has_ua),
+  score = 0.0,
+  description = 'Message has neither X-Mailer nor User-Agent header',
+  group = 'headers',
+}
+
+-- X-Mailer for old MUA versions which are forged by spammers
+local old_x_mailers = {
+  -- Outlook Express 6.0 was last included in Windows XP (EOL 2014).  Windows
+  -- XP is still used (in 2020) by relatively small number of internet users,
+  -- but this header is widely abused by spammers.
+  'Microsoft Outlook Express',
+  -- Qualcomm Eudora for Windows 7.1.0.9 was released in 2006
+  [[QUALCOMM Windows Eudora (Pro )?Version [1-6]\.]],
+  -- The Bat 3.0 was released in 2004
+  [[The Bat! \(v[12]\.]],
+  -- Can be found in public maillist archives, messages circa 2000
+  [[Microsoft Outlook IMO, Build 9\.0\.]],
+  -- Outlook 2002 (Office XP)
+  [[Microsoft Outlook, Build 10\.]],
+  -- Some old Apple iOS versions are used on old devices, match only very old
+  -- versions (iOS 4.3.5 buid 8L1 was supported until 2013) and less old
+  -- versions frequently seen in spam
+  [[i(Phone|Pad) Mail \((?:[1-8][A-L]|12H|13E)]],
+}
+
+reconf['OLD_X_MAILER'] = {
+  description = 'X-Mailer header has a very old MUA version',
+  re = string.format('X-Mailer=/^(?:%s)/{header}', table.concat(old_x_mailers, '|')),
+  score = 2.0,
+  group = 'headers',
+}
+
+-- Detect Apple Mail
+local apple_x_mailer = [[Apple Mail \((?:(?:Version )?[1-9]\d{0,2}\.\d{1,3}|[1-9]\d{0,2}\.\d{1,4}\.\d{1,4}\.\d{1,4})\)]]
+reconf['APPLE_MAILER'] = {
+  description = 'Sent with Apple Mail',
+  re = string.format('X-Mailer=/^%s/{header}', apple_x_mailer),
+  score = 0.0,
+  group = 'headers',
+}
+
+-- Detect Apple iPhone/iPad Mail
+-- Apple iPhone/iPad Mail X-Mailer contains iOS build number, e. g. 9B206, 16H5, 18G5023c
+-- https://en.wikipedia.org/wiki/IOS_version_history
+local apple_ios_x_mailer = [[i(?:Phone|Pad) Mail \(\d{1,2}[A-Z]\d{1,4}[a-z]?\)]]
+reconf['APPLE_IOS_MAILER'] = {
+  description = 'Sent with Apple iPhone/iPad Mail',
+  re = string.format('X-Mailer=/^%s/{header}', apple_ios_x_mailer),
+  score = 0.0,
+  group = 'headers',
+}
+
+-- X-Mailer header values which should not occur (in the modern mail) at all
+local bad_x_mailers = {
+  -- header name repeated in the header value
+  [[X-Mailer: ]],
+  -- Mozilla Thunderbird uses User-Agent header, not X-Mailer
+  -- Early Thunderbird had U-A like:
+  -- Mozilla Thunderbird 1.0.2 (Windows/20050317)
+  -- Thunderbird 2.0.0.23 (X11/20090812)
+  [[(?:Mozilla )?Thunderbird \d]],
+  -- Was used by Yahoo Groups in 2000s, no one expected to use this in 2020s
+  [[eGroups Message Poster]],
+  -- Regexp for genuine iOS X-Mailer is below, anything which doesn't match it,
+  -- but starts with 'iPhone Mail' or 'iPad Mail' is likely fake
+  [[i(?:Phone|Pad) Mail]],
+}
+
+reconf['FORGED_X_MAILER'] = {
+  description = 'Forged X-Mailer header',
+  re = string.format('X-Mailer=/^(?:%s)/{header} && !X-Mailer=/^%s/{header}',
+      table.concat(bad_x_mailers, '|'), apple_ios_x_mailer),
+  score = 4.5,
+  group = 'headers',
+}
+
+-- X-Mailer headers like: 'Internet Mail Service (5.5.2650.21)' are being
+-- forged by spammers, but MS Exchange 5.5 is still being used (in 2020) on
+-- some mail servers. Example of genuine headers (DC-EXMPL is a hostname which
+-- can be a FQDN):
+-- Received: by DC-EXMPL with Internet Mail Service (5.5.2656.59)
+-- 	id <HKH4BJQX>; Tue, 8 Dec 2020 07:10:54 -0600
+-- Message-ID: <E7209F9DB64FCC4BB1051420F0E955DD05C9D59F@DC-EXMPL>
+-- X-Mailer: Internet Mail Service (5.5.2656.59)
+reconf['FORGED_IMS'] = {
+  description = 'Forged X-Mailer: Internet Mail Service',
+  re = [[X-Mailer=/^Internet Mail Service \(5\./{header} & !Received=/^by \S+ with Internet Mail Service \(5\./{header}]],
+  score = 3.0,
+  group = 'headers',
+}