Now that we've got our new mail server going and the DMARC reports are coming in, I'm finding a lot of DMARC failures for messages that I'm sending to this list.
It seems that when I send a message to this list, the list software forwards it to other people on my behalf, but uses my email address in the header_from. This results in an SPF failure, because SPF only allows our MX to send mail for our domain. The DKIM check is also failing. I think the list software may be re-writing the message bodies. Another user that I replied to on this list a day ago said my list mail went to spam on his gmail. 1. Will our domain reputation be harmed by having a lot of copies of the same messages going to a bunch of different people on different ISPs and all of them failing DMARC? It seems that some places are using databases that look for duplicate content sent to multiple recipients to identify bulk mail and spam. 2. Is there any way to mitigate DMARC issues for mailing lists? It seems like the mailing list software should be sending out the emails as itself, not as the user that submitted the message.
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