I've been looking for a way to do this as well. Thanks for posting the feature request :)
To anyone else that comes across this thread, here's the link to it... https://bugzilla.proxmox.com/show_bug.cgi?id=2641
I'm not sure how Zimbra handles the signing, but as far as I can tell it signs it before relaying to PMG, as if it was simply sending the email to it's destination. Then I guess PMG sends it unaltered since I'm not doing any other processing there, other than the outbound spam/virus checks.
I...
I can understand where you're coming from now, and can see the benefit there for some setups. I guess I really didn't need to add that last line, sorry about that.
Since I already had Zimbra setup to do DKIM it didn't make much sense to change it now. I was just pointing out that it does relay...
Yes, they are all relaying through PMG. The only thing I've noticed having an issue with are mails coming from PMG itself, like bounce-backs, that aren't signed with the mta's domain dkim. But I'm not overly concerned with those. I wonder if there's a way to pass system emails to Zimbra and have...
I just setup PMG as a mail gateway for my Zimbra install which uses multiple backend servers for each domain, each handling their own DKIM signing, etc. and have had no issues sending DKIM signed emails out through PMG, or receiving them from outside sources.
All tests I've done have come back...
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