In order to simplify auto-response suppression and other filtering, I want to
synthesise an Auto-Submitted header on notification mails that should have them
but do not.
In a sieve file I add the following:
if anyof ( header :contains ["From","Sender"] “i...@example.com" ) {
if header :contains "Subject" [" just joined "," just left "] {
if not exists "Auto-Submitted" {
addheader "Auto-Submitted" "auto-generated (via sieve)";
}
}
However this doesn’t work and results in the following error
> main script: line 205: warning: addheader action: specified header field
> `Auto-Submitted' is protected; modification denied.
(Workaround for this specific issue would probably be to use a List-* header
instead.)
Looking at
http://hg.rename-it.nl/dovecot-2.2-pigeonhole/file/c8edece267cd/src/lib-sieve/plugins/editheader/ext-editheader-common.c
I can see that "Auto-Submitted” and “Received” are hardcoded to be blocked
without reference to whether they are to be added or removed.
However, the hard restriction in RFC 5293 on Auto-Submitted and Received only
applies to the use of deleteheader and not addheader.
https://tools.ietf.org/html/rfc5293#section-6
> As a matter of local policy, implementations MAY limit which header
> fields may be deleted and which header fields may be added. However,
> implementations MUST NOT permit attempts to delete "Received" and
> "Auto-Submitted" header fields and MUST permit both addition and
> deletion of the "Subject" header field.
Using Dovecot version 2.1.7 but I assume it’s not version specific issue.
