[Mailman-Users] mailman + postfix = strange behaviour

[Marek Kozlowski]

:-)
>> SMTP_MAX_RCPTS = 1
>> (http://www.mailinglistarchive.com/mailman-users@python.org/msg08741.html 
>> -- thanks Mark!)
>> helped. Still I'mnot sure why :-(
> 
> 
> It helps because of a bug in the underlying Python smtplib. See
> <http://bugs.python.org/issue5713>
> 
> Your real problem is you have addresses on your list that Postfix
> thinks are undeliverable. The bug report linked above describes the
> scenario.
> 
> After 20 invalid local recipients in one SMTP transaction, Postfix
> disconnects with a 421 Too many errors reply, but the Python smtplib
> module doesn't expect a disconnect after a 421 and gets out of sync
> with Postfix.
> 
> Setting SMTP_MAX_RCPTS to any number less than 20 will avoid this
> problem.

THANKS A LOT!!! Now it works and I do know why! Wonderful!

Best tregards,
Marek Kozłowski