[Mailman-Users] DMARC bouncing of yahoo and hotmail users

Mark Sapiro mark at msapiro.net
Wed Apr 13 18:06:16 EDT 2016

On 4/13/16 11:22 AM, Ricardo Kleemann wrote:
> I've started noticing bounces to yahoo and hotmail users with this
> rejection message:
>  Unfortunately, messages from (xxx) on behalf of (yahoo.com.br) could not
> be delivered due to domain owner policy restrictions. (in reply to end of
> DATA command))

Yahoo recently started applying DMARC p=reject to more domains. See

> In researching this problem I found this thread:
> http://osgeo-org.1560.x6.nabble.com/OSGeo-1454-mailman-Mass-bouncing-of-yahoo-user-subscriptions-td5181289.html
>>From the thread it seems to indicate that Mailman v2.1.19 would have a
> workaround for the issue.
> First, does anyone know if the updates in Mailman do indeed address the
> issue?

There have been workarounds for this issue since 2.1.16, but they didn't
get serious until 2.1.18 and have seen continuous tweaking since then.

See the FAQ articles at <http://wiki.list.org/DEV/DMARC> and

> Second, my server is running Ubuntu linux with Mailman v2.1.16 and I'm not
> able to update to a new version via the apt-get command since this version
> of Ubuntu has v2.1.16 as the "latest". Is it safe for me to update Mailman
> via a tarball and not mess up the packaged installation?

See the FAQ at <http://wiki.list.org/x/17891606>.

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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