On 27.01.18 11:16, CP wrote:
I'm trying to eliminate a problem with duplicate emails in alias expansion
and I have seen that some (local generated and SMTP also) messages
don't have the
Message-ID header . I'm reading in in postconf that there is a
configuration
option always_add_missing_headers that does exactly that. If I
enable this
option do I get in any risk of braking anything in my existing setup ?
The manual refers that " this may break DKIM signatures that cover
non-existent headers"
but I'm not sure if that refers to local generated messages or
everything received my SMTP.
I'm not currently using DKIM in my setup.
If you receive dkim-signed mail without message-id, but the dkim signature
will claim it contains message-id too (does this happen?), and when you add
it, the message will not pass the check (including your message-id changes
the hash).
this should not be a problem if you aren't resending the mail to outside,
and can be avoided by checking the DKIM before message-id is added and never
later.
--
Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
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