[Mailman-Users] gmail

[John Levine]

In article <5B99C857.19328.61F1D54B at bernie.fantasyfarm.com> you write:
>Well, something changed between Thursday and Friday, because posts to the list 
>were fine and this one generated a bounce for every gmail member.

Any chance that the message in question had a From: address in a
domain that publishes a restrictive DMARC policy?  That can cause
bounces all over the place.

The usual suspects here are aol.com and yahoo.com, but a lot of
companies that believe (usually wrongly) that they have a problem
that DMARC can solve set DMARC policies, too.

R's,
John