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

[Mark Sapiro]

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

SMTP_MAX_RCPTS = 1

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

VERP_CONFIRMATIONS = Yes
VERP_PASSWORD_REMINDERS = Yes
VERP_PERSONALIZED_DELIVERIES = Yes
VERP_DELIVERY_INTERVAL = 1

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