[Mailman-Users] List posts sent to AOL list subscribers bounce as undeliverable (v. 2.1.20)

Brian Carpenter brian at emwd.com
Fri Dec 4 17:40:31 EST 2015

What version of Mailman are you using? The DMARC settings are found on the General Options and Sender Filters pages.

Brian Carpenter

Providing Cloud Services and more for over 15 years.

T: 336.755.0685
E: brian at emwd.com


> -----Original Message-----
> From: Mailman-Users [mailto:mailman-users-
> bounces+brian=emwd.com at python.org] On Behalf Of Woody Mon via
> Mailman-Users
> Sent: Friday, December 04, 2015 5:31 PM
> To: mailman-users at python.org
> Cc: mediamon2003 at yahoo.com
> Subject: Re: [Mailman-Users] List posts sent to AOL list subscribers bounce as
> undeliverable (v. 2.1.20)
> FYI, I'm just using a Yahoo email account (via web interface) to post to the
> Mailman-users list. I don't use this account for much anything else.
> All posts to the list in question are moderated and almost all are sent from a
> Mozilla Thunderbird email client.
> And almost all subscribers (including AOL subscribers) are set for digest
> mode.
> In the list mail the from line always shows the
> listname at subdomain.domain1.org (not an individual email address or
> freemail domain)
> How do I find these DMARC workarounds which you speak?
> --------------------------------------------
> On Fri, 12/4/15, John wrote:
>  I see that you have a yahoo.com address.  If there's a yahoo.com address on
> the From: line of the list mail, AOL and Yahoo's well documented abuse of
> DMARC will cause the failure you're seeing.
>  If you're running a recent version of Mailman, there are some DMARC
> workarounds you can use.  Other than that, I'd find a different address to
> mail from, not at Yahoo, not at AOL, and preferably not at Gmail.
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