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Editheader Extension
Relevant specifications
=======================
RFC5293 - doc/rfc/editheader.rfc5293.txt
Description
===========
The editheader extension [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 1k
sieve_editheader_max_header_size = 1k
# Protected special headers
sieve_editheader_forbid_add = X-Verified
sieve_editheader_forbid_delete = X-Verified X-Seen
}