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

[Max Pyziur]

Greetings,

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.

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

Much thanks,

Max Pyziur
pyz at brama.com