I believe the problem is reverse DNS is not working correctly. I guess the email is going out as the IP address of the firewall not the server. Problem is that I am using NAT to bind external to internal? Thanks, Shawn. -----Original Message----- From: Jamie A. Byrnes [mailto:jabyrnes@xxxxxxxxxxxxxxxxx] Sent: Thursday, August 28, 2003 4:36 PM To: [ExchangeList] Subject: [exchangelist] RE: SMTP Protocol Error http://www.MSExchange.org/ Have you tried telneting to your server and putting in a test message to them? Does it accept it normally? -----Original Message----- From: Shawn Moua [mailto:smoua@xxxxxxxxxxxxxxx] Sent: Friday, 29 August 2003 2:05 AM To: [ExchangeList] Subject: [exchangelist] RE: SMTP Protocol Error http://www.MSExchange.org/ It's been going on for about a week or so. Internal side is clean (virus wise) however I do occasionally see a whole bunch of denied entries in the firewall log (using WatchGuard Firebox). Reverse DNS lookup looks good as well? Thanks, Shawn. -----Original Message----- From: Jamie A. Byrnes [mailto:jabyrnes@xxxxxxxxxxxxxxxxx] Sent: Wednesday, August 27, 2003 9:22 PM To: [ExchangeList] Subject: [exchangelist] RE: SMTP Protocol Error http://www.MSExchange.org/ Hi Shawn, I don't know of anything specific that causes these transient problems, but the same or similar messages are generated when the delivery pipe is squished somewhere along the way. Ie. The connection is established (HELO) but transmission fails during the transfer. Could be a failed router/redirected path, or high traffic due to a worm or similar. IOW, try again tomorrow. Jamie. -----Original Message----- From: Shawn Moua [mailto:smoua@xxxxxxxxxxxxxxx] Sent: Thursday, 28 August 2003 2:50 AM To: [ExchangeList] Subject: [exchangelist] RE: SMTP Protocol Error http://www.MSExchange.org/ The other similar event is "The connection was dropped by the remote host". The sender is getting the following back: This is an automatically generated Delivery Status Notification. THIS IS A WARNING MESSAGE ONLY. YOU DO NOT NEED TO RESEND YOUR MESSAGE. Delivery to the following recipients has been delayed. azsiongco@xxxxxxxxxxxxxxxxxxxxxxx Thanks, Shawn Moua -----Original Message----- From: Robert Abela [mailto:robert@xxxxxxx] Sent: Wednesday, August 27, 2003 12:37 AM To: [ExchangeList] Subject: [exchangelist] RE: SMTP Protocol Error http://www.MSExchange.org/ Do you have any other related errors in the event viewer of the mailserver? -----Original Message----- From: Shawn Moua [mailto:smoua@xxxxxxxxxxxxxxx] Sent: Tuesday, August 26, 2003 10:43 PM To: [ExchangeList] Subject: [exchangelist] SMTP Protocol Error http://www.MSExchange.org/ I am getting "An SMTP protocol error occurred" error message when trying to to send out emails to one or two places (one is AOL). Any ideas? Thanks, Shawn. ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: robert@xxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub') This mail was content-checked for malicious code and viruses by GFI MailSecurity. 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