clncoin@??? (Coin) [Monday, August 26, 2002 5:52 PM]:
> support@???
> SMTP error from remote mailer after EHLO
> mx1.nxxx.com:
> host mail.opensrs.org [216.40.33.61]: 503
> www.opensrs.org Duplicate HELO/EHLO
The usual problem is where either you or the remote server has a Cisco Pix
or Checkpoint Firewall frontending their mailserver.
If you have that running, I'd suggest
# no fixup protocol smtp 25
-srs