On 3/6/24 11:59 AM, j...@janalexander.ca wrote:
Routinely, email posts from Microsoft (.hotmail, .live, .me) and now more 
recently Apple (.icloud and .mac) are being bounced en masse.


What are the reasons for these bounces. If you are not currently seeing bounce DSNs set the list's Bounce processing -> bounce_notify_owner_on_disable setting to Yes and if available, also set bounce_notify_owner_on_bounce_increment.
        

Is there something we or our host can do to stop this from happening?

At a minimum, assuming Mailman >= 2.1.18, set Privacy options... -> dmarc_moderation_action to Munge From and dmarc_quarantine_moderation_action to Yes. See <https://wiki.list.org/DEV/DMARC>.

--
Mark Sapiro <m...@msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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