RE: [courier-users] esmtpd suddenly rejects traffic

[Bowie B. <Bowie_Bailey@BUC.com>]

From: Michael Jinks [mailto:mj...@mi...]
> 
> When I try to connect to Courier from one of the cluster machines via
> telnet, I get this:
> 
> harper:~$ telnet heavy.uchicago.edu 25
> Trying 128.135.0.56...
> Connected to heavy.uchicago.edu (128.135.0.56).
> Escape character is '^]'.
> 220 ************************
>                [odd... session continues:]
> ehlo harper.uchicago.edu
> 502 ESMTP command error

I had a similar problem after upgrading our firewall.  The main symptom is
the strange SMTP banner.
I fixed it by telling the firewall not to mess with the SMTP traffic.

On a Cisco PIX firewall, it's done like this:
     no fixup protocol smtp 25

Bowie