Hi,
my mail server (Kerio) can apply DKIM signatures. Piping DKIM signed
mails through Ciphermail disrupts the validity of the DKIM signatures.
Postfix on the Ciphermail server has to apply the DKIM signature after
the mail was processd by Ciphermail. This could be achieved by following
these howtos:
https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-dkim-with-postfix-on-debian-wheezy
http://unixwars.blogspot.de/2015/01/8bitmime-and-dkim-body-authentication.html
The second is required at my site because without it mails sent by
Thunderbird fail validation by remote servers. My master.cf now looks
like this:
smtp inet n - - - - smtpd
-o
message_size_limit=${djigzo_before_filter_message_size_limit}
-o content_filter=smtp-downconvert:127.0.0.1:10026
pickup fifo n - - 60 1 pickup
...
...
...
# cleanup for reinject so we can set the hopcount_limit differently for
the reinjection port
cleanup_reinject unix n - - - 0 cleanup
-o hopcount_limit=100
smtp-downconvert unix - - - - 2 smtp
-o smtp_discard_ehlo_keywords=8bitmime,silent-discard
127.0.0.1:10026 inet n - n - 10 smtpd
-o content_filter=
...
...
...
Suggestion: Add a DKIM config option to Ciphermail :-)
cheers
Matthias
--
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