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diff --git a/README_FILES/MAILDROP_README b/README_FILES/MAILDROP_README new file mode 100644 index 0000000..e1d320e --- /dev/null +++ b/README_FILES/MAILDROP_README @@ -0,0 +1,129 @@ +PPoossttffiixx ++ MMaaiillddrroopp HHoowwttoo + +------------------------------------------------------------------------------- + +IInnttrroodduuccttiioonn + +This document discusses various options to plug the maildrop delivery agent +into Postfix: + + * Direct delivery without the local delivery agent + * Indirect delivery via the local delivery agent + * Credits + +DDiirreecctt ddeelliivveerryy wwiitthhoouutt tthhee llooccaall ddeelliivveerryy aaggeenntt + +Postfix can be configured to deliver mail directly to maildrop, without using +the local(8) delivery agent as an intermediate. This means that you do not get +local aliases(5) expansion or $HOME/.forward file processing. You would +typically do this for hosted domains with recipients that don't have UNIX home +directories. + +The following example shows how to use maildrop for some.domain and for +someother.domain. The example comes in two parts. + +Part 1 describes changes to the main.cf file: + + 1 /etc/postfix/main.cf: + 2 maildrop_destination_recipient_limit = 1 + 3 virtual_mailbox_domains = some.domain someother.domain + 4 virtual_transport = maildrop + 5 virtual_mailbox_maps = hash:/etc/postfix/virtual_mailbox + 6 virtual_alias_maps = hash:/etc/postfix/virtual_alias + 7 + 8 /etc/postfix/virtual_mailbox: + 9 user1@some.domain ...text here does not matter... + 10 user2@some.domain ...text here does not matter... + 11 user3@someother.domain ...text here does not matter... + 12 + 13 /etc/postfix/virtual_alias: + 14 postmaster@some.domain postmaster + 15 postmaster@someother.domain postmaster + + * Line 2 is needed so that Postfix will provide one recipient at a time to + the maildrop delivery agent. + + * Line 3 informs Postfix that some.domain and someother.domain are so-called + virtual mailbox domains. Instead of listing the names in main.cf you can + also list them in a file; see the virtual_mailbox_domains documentation for + details. + + * Line 4 specifies that mail for some.domain and someother.domain should be + delivered by the maildrop delivery agent. + + * Lines 5 and 8-11 specify what recipients the Postfix SMTP server should + receive mail for. This prevents the mail queue from becoming clogged with + undeliverable messages. Specify an empty value ("virtual_mailbox_maps =") + to disable this feature. + + * Lines 6 and 13-15 redirect mail for postmaster to the local postmaster. RFC + 821 requires that every domain has a postmaster address. + +The vmail userid as used below is the user that maildrop should run as. This +would be the owner of the virtual mailboxes if they all have the same owner. If +maildrop is suid (see maildrop documentation), then maildrop will change to the +appropriate owner to deliver the mail. + +Note: Do not use the postfix user as the maildrop user. + +Part 2 describes changes to the master.cf file: + + /etc/postfix/master.cf: + maildrop unix - n n - - pipe + flags=ODRhu user=vmail argv=/path/to/maildrop -d ${recipient} + +The pipe(8) manual page gives a detailed description of the above command line +arguments, and more. + +If you want to support user+extension@domain style addresses, use the following +instead: + + /etc/postfix/master.cf: + maildrop unix - n n - - pipe + flags=ODRhu user=vmail argv=/path/to/maildrop + -d ${user}@${domain} ${extension} ${recipient} ${user} ${nexthop} + +The mail is delivered to ${user}@${domain} (search key for maildrop userdb +lookup). The ${extension} and the other address components are available to +maildrop rules as $1, $2, $3, ... and can be omitted from master.cf or ignored +by maildrop when not needed. + +With Postfix 2.4 and earlier, use ${nexthop} instead of ${domain}. + +IInnddiirreecctt ddeelliivveerryy vviiaa tthhee llooccaall ddeelliivveerryy aaggeenntt + +Postfix can be configured to deliver mail to maildrop via the local delivery +agent. This is slightly less efficient than the "direct" approach discussed +above, but gives you the convenience of local aliases(5) expansion and +$HOME/.forward file processing. You would typically use this for domains that +are listed in mydestination and that have users with a UNIX system account. + +To configure maildrop delivery for all UNIX system accounts: + + /etc/postfix/main.cf: + mailbox_command = /path/to/maildrop -d ${USER} + +Note: ${USER} is spelled in upper case. + +To enable maildrop delivery for specific users only, you can use the Postfix +local(8) delivery agent's mailbox_command_maps feature: + + /etc/postfix/main.cf: + mailbox_command_maps = hash:/etc/postfix/mailbox_commands + + /etc/postfix/mailbox_commands: + you /path/to/maildrop -d ${USER} + +Maildrop delivery for specific users is also possible by invoking it from the +user's $HOME/.forward file: + + /home/you/.forward: + "|/path/to/maildrop -d ${USER}" + +CCrreeddiittss + + * The original text was kindly provided by Russell Mosemann. + * Victor Duchovni provided tips for supporting user+foo@domain addresses. + * Tonni Earnshaw contributed text about delivery via the local(8) delivery + agent. + |