I think when two Exchange servers within the same Exchange org talk to each other on the SMTP port, they try to use some verbs that only they could understand (like XEXCH50, X-LINK2STATE, BDAT etc), plus I think the caller wants to authenticate using the AUTH command (using Windows Integrated Authentication I think). So when you put a non-Exchange server on port 25, it probably doesn't understand what the incoming Exchange server is trying to say.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Neil Doody Sent: Tuesday, April 20, 2004 3:39 AM To: Exchange Discussions Subject: RE: Exchange & SMTP Port numbers > Oh that's going to suck on a number of different levels. For one thing, > a bunch of Exchange specific verbs aren't going to be available for the > other servers attempting to communicate with it. Which means things like > the expanded list of alternate recipients won't be able to be passed, so > your categorizer could wind up doing additional expansion and > duplicating messages. I figured as much, i.e. that the transport between servers is not strictly standard SMTP compliant or there is something odd. > What happens to those messages now? Do they NDR or sit in the queue? > Have you considered a dedicated box for the Norton product or an > Exchange aware AV scanner? They just sat in a queue until I put the SMTP service back to port 25, the queue name was (from the Dartford server) REDDITCHEXCH (Remote Delivery) or along those lines. I have gone about the idea a different way now, as I have a qmail box running at the edge of our network (i.e. accepting all mail from the internet) which then runs spamassassin for me, I changed the smtproute to REDDITCHEXCH:26. Changing the smtp route means that the qmail box will now transport all emails to the REDDITCHEXCH on port 26. I have set Symantec SMTP Gateway to listen on port 26 and forward emails to port 25, jobs a gooden! Cheers for the help. _________________________________________________________________ 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. Attn: Discussion List Management 475 Park Avenue South New York, NY 10016 Please include the email address which you have been contacted with. _________________________________________________________________ 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. Attn: Discussion List Management 475 Park Avenue South New York, NY 10016 Please include the email address which you have been contacted with.
