Shawn Heisey:
> smtpd_delay_reject = yes
This will apply the client, helo, and sender restrictions
AFTER Postfix receives the RCPT TO command.
In other words, Postfix never applies restrictions when the
client connects, when the client send EHLO, or when the
client sends the MAIL FROM command.
> May 18 16:19:29 nexus2 postfix/smtpd[18002]: connect from
> monitor.example.com[10.2.1.39]
> May 18 16:19:29 nexus2 postfix/smtpd[18002]: improper command pipelining
> after MAIL from monitor.example.com[10.2.1.39]
This applies restrictions before RCPT TO, so you reported
the wrong Postfix configuration, or you have parameter
settings in master.cf that you should also report about.
Wietse
