I've set DKIM in my Zimbra box following the instructions in http://wiki.zimbra.com/wiki/Configuring_for_DKIM_Signing, and it works fine.
After setting DMARC to receive reports, I found one serious problem with DKIM and distribution lists, which I use heavily. The problem is that when someone with an external email address (let’s say email@example.com) sends a message to one list, that message is redistributed to the recipients of the list with a ‘from:’ field identified as firstname.lastname@example.org. Since I’m not gmail, both DKIM and SPF fail (former because I can’t sign as gmail, latter as Google’s SPF record doesn’t set me as an authorized sender). Is there any solution to this? Any setting I can do to fix this?
PS: I’m using Zimbra 8.5.1 in an Ubuntu 12.4 box
I'm not really sure I understand what you're saying here. If your server receives an email from (let's say) a user with a gmail address and is destined for a distribution list the DKIM & SPF checks are performed (on the google records) on the email for validity prior to it's delivery, it is then sent to it's intended recipient. It makes no difference whether the recipient is a distribution list or a single user on your server.
I am experiencing exactly the same issue and from a google search it seems there is no way to solve it.
Did you find any solution/workaround to replace the sender with the list address?
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