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Pigeonhole Sieve: Editheader Extension
======================================
The *editheader* extension (RFC5293 [http://tools.ietf.org/html/rfc5293/])
enables Sieve scripts to delete and add message header fields, thereby allowing
interaction with other components that consume or produce header fields.
Configuration
-------------
The *editheader* extension is not available by default and needs to be enabled
explicitly by adding it to the 'sieve_extensions' setting.
The following settings can be configured for the *editheader* extension
(default values are indicated):
sieve_editheader_max_header_size = 2048 :
The maximum size in bytes of a header field value passed to the 'addheader'
command. The minimum value for this setting is 1024 bytes. The value is in
bytes, unless followed by a k(ilo).
sieve_editheader_forbid_add = :
A space-separated list of headers that cannot be added to the message header.
Addition of the 'Subject:' header cannot be prohibited, as required by the
RFC specification. Therefore, adding this header to this setting has no
effect.
sieve_editheader_forbid_delete = :
A space-separated list of headers that cannot be deleted from the message
header. Deleting the 'Received:' and 'Auto-Submitted:' fields is always
forbidden, while removing the 'Subject:' header cannot be prohibited, as
required by the RFC specification. Therefore, adding one of these headers to
this setting has no effect.
sieve_editheader_protected = :
A space-separated list of headers that cannot be added to or deleted from the
message header. This setting is provided for backwards compatibility. It is a
combination of the 'sieve_editheader_forbid_add' and
'sieve_editheader_forbid_delete' settings. The same limitations apply.
Invalid values for the settings above will make the Sieve interpreter log a
warning and revert to the default values.
Example
-------
---%<-------------------------------------------------------------------------
plugin {
# Use editheader
sieve_extensions = +editheader
# Header fiels must not exceed one kilobyte
sieve_editheader_max_header_size = 1k
# Protected special headers
sieve_editheader_forbid_add = X-Verified
sieve_editheader_forbid_delete = X-Verified X-Seen
}
---%<-------------------------------------------------------------------------
(This file was created from the wiki on 2019-06-19 12:42)
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