[Mailman-Users] Google mail servers reply "Multiple destination domains per transaction is unsupported "

Mark Sapiro mark at msapiro.net
Fri Mar 8 06:29:56 CET 2013

On 3/7/2013 6:51 PM, Max Pyziur wrote:
> We received the following while sending out a newsletter/notification to
> a 6,000+ email list:
> <<< 451 4.3.0 try again. ac8si27848234obc.211 - gsmtp
> Deferred: 451-4.3.0 Multiple destination domains per transaction is
> unsupported.  Please ... while talking to aspmx.l.google.com
> This reads like a configuration issue on the those businesses and
> educational institutions who rely on Google mail servers.

It's hard to say, but it seems that you have list members in multiple
domains all served by the same google mail MX, and google doesn't like
receiving multiple recipient domains in a single SMTP transaction.

> Is there a way for the sender (us) to be whitelisted, or is this matter
> handled at the receivers' end?

I don't know about whitelisting, but if you set


in mm_cfg.py you will avoid the issue by never sending to more than one
recipient in a single SMTP transaction. And if you do that, you might as
well VERP everything by putting


in mm_cfg.py as there will be no additional penalty for doing so.

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

More information about the Mailman-Users mailing list