[Mailman-Users] Excessive bounces to list members on my list

Mark Sapiro mark at msapiro.net
Wed Apr 30 17:06:12 CEST 2014

On 04/30/2014 07:20 AM, Larry Kuenning wrote:
> I think the reason Yahoo groups don't have to rewrite the From line is
> that even if the original sender uses an @yahoo address, passing the
> message through a Yahoo groups server won't break the DMARC tests
> because it's still a yahoo server and therefore "aligns" with the
> original From address.  Or so I understand it:  Mark or somebody correct
> me if I'm wrong?

More or less correct. Yahoo groups DKIM signs with d=yahoogroups.com, so
that doesn't align with the sender's From: @yahoo.com, but as I noted in
another reply, they set the envelope sender to
... at returns.groups.yahoo.com and that passes SPF and does align.

> But now I wonder what happens if a user with an @aol address posts to a
> Yahoo group.  Will it run afoul of AOL's p=reject policy?  If I still
> had an AOL address I'd be tempted to try this just to see what happens.

I will test this when I get time.

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

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