It was ScanMail 3.82. After enabling only inbound smtp real-time scanning, newly submitted messages started to flow without problems, but the ones that were already stuck remained stuck. I had to open them with notepad and make them look presentable, then save them into Pickup directory and they went out.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Alverson, Tom Sent: Thursday, February 19, 2004 12:02 PM To: Exchange Discussions Cc: '[EMAIL PROTECTED]' Subject: RE: Exchange 5.5 SMTP timeout In our case, we were able to verify that it was an MTU problem by using the ping test to determine the maximum packet size, and then doing a network capture of a failed smtp conversation. From the capture we could see that the packets were too large to fit through the VPN. http://www.dslreports.com/tweaks/MTU (how to find max mtu for a particular host) http://www.dslreports.com/drtcp handy utility to easily change maxmtu in the registry. -----Original Message----- From: Fyodorov, Andrey FTL [mailto:[EMAIL PROTECTED] Sent: Thursday, February 19, 2004 10:18 AM To: Exchange Discussions Subject: RE: Exchange 5.5 SMTP timeout I was thinking MTU too, but in our case it does not work even when we try to route to a machine on the same subnet. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Alverson, Tom Sent: Thursday, February 19, 2004 10:02 AM To: Exchange Discussions Cc: '[EMAIL PROTECTED]' Subject: RE: Exchange 5.5 SMTP timeout We had a problem like this when we tried to send emails to our parent company through a VPN. Although it had worked fine for years, somebody changed something one day which broke SMTP sending just like yours. It turned out to be a MTU problem. I think we just had to lower our max mtu in the registry (and probably reboot) to make the packets fit through the VPN. Tom -----Original Message----- From: Fyodorov, Andrey FTL [mailto:[EMAIL PROTECTED] Sent: Thursday, February 19, 2004 9:36 AM To: Exchange Discussions Subject: RE: Exchange 5.5 SMTP timeout When SMTP logging is cranked to the max, data transmission will be logged. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ed Crowley [MVP] Sent: Thursday, February 19, 2004 4:15 AM To: Exchange Discussions Subject: RE: Exchange 5.5 SMTP timeout The log won't show the data being sent. Ed Crowley MCSE+Internet MVP Freelance E-Mail Philosopher Protecting the world from PSTs and Bricked Backups!T -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Fyodorov, Andrey FTL Sent: Wednesday, February 18, 2004 8:11 PM To: Exchange Discussions Subject: Exchange 5.5 SMTP timeout One of the Exchange 5.5 servers at this place has a few large messages in its outgoing IMC queue and can't send them. Normally the server sends all outgoing mail to a couple of Exim boxes. For some reason it can't push these messages out. Other outgoing messages are flowing fine. I can see in the logs that the SMTP conversation is going on correctly until the Exchange server sends DATA and Exim says "Enter mail, end with "." on a line by itself" I am not sure if the Exchange server actually sends any data after that. But it just silently disconnects 10 minutes later. I don't think that this is a problem with Exim. I have tried to point this 5.5 server to other SMTP servers (Sendmail, Exchange 2000) with the same results. I have also configured it to use DNS - it makes connections to the remote hosts and then times out 10 minutes later. I think I have run into some similar problems some time ago, actually supporting Exchange 2000 SMTP boxes, but I can't quite remember now... This 5.5 server is behind a PIX firewall. Could that cause problems with the DATA command? or maybe it somehow screws up the SIZE command? (smaller messages are moving fine, but these 3-5MB messages are getting stuck) _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/cgi-bin/lyris.pl?enter=exchange&text_mode=&lang =english To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] To unsubscribe via postal mail, please contact us at: Jupitermedia Corp. 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