[Mailman-Users] Low level smtp error: Server not connected

[Stephen J. Turnbull]

Leonard Jacobs writes:

 > "delivery to someone at gmail.com failed with code -1: (104,
 > 'Connection reset by peer')" I am also seeing many " Low level smtp
 > error: Server not connected, msgid" errors.

This seems likely to be either a Postfix problem, or maybe you've
caught a social disease (ie, a bunch of big ISPs have decided you're a
spammer).  Either way, the first place to investigate is the Postfix
logs.