Mailing List Message #98160
From: Nicolas Hatier <>
Subject: Re: Bad SMTP prompt at the host, smtp closing connection during sending
Date: Wed, 24 Jun 2009 13:19:54 -0400
To: CommuniGate Pro Discussions <> looks ok for us.

You probably have a PIX firewall (or other Cisco firewall) with the "SMTP fixup" option enabled. You should disable this as it interferes with CGP, inbound and outbound.


sjakie wrote:

We have problems sending emails to some providers (among them <>). It looks like CommunigatePro is closing connection while handshaking. We are not blacklisted. It looks like our ptr's are ok. Looked over a lot of the AUTH settings. Unfortunately, no solution yet. Multihoming could be an issue, however, untill 3 weeks earlier it all seemed ok with same settings and multihoming.

This is the bounce message:

Reporting-MTA: dns; <>

Original-Recipient: rfc822;< <>>
Final-Recipient: rfc822;< <>>
Action: failed
Status: 4.0.0

Failed to deliver to '' <>
SMTP module(domain <>) reports: <>: Bad SMTP prompt at the host


We have a firewall/router and is our mail server IP (natted, WAN IP is I have listed here two log sections from our mail server:


*Nicolas Hatier* < <>>
Niversoft idées logicielles -

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