penpals: consider message-ids in references headers

Hi!

Thanks for the penpals feature!

However sometimes, the replies that should be white-listed
are sent
using different from-addresses. In this case, the current
pen-pal-feature won't work.
But if the follow-up correspondence is a real reply, the
"References" or
"In-Reply-To" headers will contain the original
message-id.

If the pen pals feature could additionally check if the
message-ids in
the "References" or in the "In-Reply-To"
headers of an incoming mail
match a message-id of a previously outgoing mail from a
local_domain,
mails that were replied using different from-addresses would
also
benefit from the whitelisting bonus.

Cheers,
--leo
-- 
------------------------------------------------------------
-----------
Alexander.Bergolthwu-wien.ac.at                Fax:
+43-1-31336-906050
Zentrum fuer Informatikdienste - Wirtschaftsuniversitaet
Wien - Austria


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