Our list server has been upgraded with new hardware and a newer version of the mailman list software. Most importantly, the new dmarc_moderation_action has been set to “Munge From” for all lists on the server. This change will allow the server to rewrite the from header when sending messages to domains that would reject the email due to strict DMARC policies. This change will be most noticed by list users with yahoo.com and aol.com email addresses. I have started a forum post here for discussion: https://forums.sonic.net/viewtopic.php?f=5&t=2139 . Please let us know if you have any problems.
-Grant and System Operations