I have been trying to figure out a problem with MDaemon listmail. Some members don’t see original posts until another member replies to the original post. I have no clue whether this behavior is related to DMARC but I would appreciate any suggestions/recommendations that may help. I have been using DMARC for awhile now with p set to quarantine. Since joining dmarcian I have been implementing policy change. I currently have p=reject and pct=5. The behavior noted above has not changed. My knowledge of DMARC is limited and I am curious how p being set to quarantine or reject would affect the sending of listmail, if any?
Thanks,
mux
Hi mux and welcome to the forums!
A restrictive DMARC policy on a sending domain participating in your list discussion definitely could be rejected or quarantined. It all depends on the sending domain’s policy. This means either when a user sends to a list address, or a member replies to an existing list discussion.
There are 2 options of notes in MDaemon that could impact users with restrictive DMARC policies.
- “Refuse messages from domains with restrictive DMARC policies” under Mailing List Settings.
- “Replace From email address with list’s email address if message is sent from a domain that publishes restrictive DMARC policy.” found in the Headers screen of the Mailing List section.
To ensure delivery of emails from domains with a restrictive DMARC policy, option #1 needs to be disabled, while option #2 must be enabled.
I would check those options first. If that does not help, then I would imagine DMARC is likely not the culprit. However, a more in depth investigation and reviewing samples of impacted emails would be my recommendation.
I hope this helps!
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