>umoncton.ca MX preference = 20, mail exchanger = cujam.ci.umoncton.ca >umoncton.ca MX preference = 10, mail exchanger = altair.ci.umoncton.ca > >cujam.ci.umoncton.ca internet address = 139.103.2.10 >altair.ci.umoncton.ca internet address = 139.103.2.3 > >Our logs show attempts to connect to 139.103.2.3 only. Interestingly, I >cannot telnet to 139.103.2.3, but I can to 139.103.2.10.
Here, I can not connect to 139.103.2.3. I'm guessing umoncton.ca is one of these extremely poorly designed domains that intentionally has a wasteful MX record that goes nowhere (read: they have clueless admins). >Symantec's knowledgebase has an entry on mx rollover issues, and blames the >smtp server. It states: "Some mail servers will not roll over to the second >MX record because they do not properly interpret the 421 SMTP error message >returned by the firewall. The mail server believes it has already made a >successful connection with the remote mail server when it has only >communicated with the Raptor Firewall's SMTP proxy. The SMTP server will not >even try the second MX record." The problem here is with Symantec. They are translating umoncton.ca's "You aren't allowed to connect here" (which IMail properly handles as a "try the next MX record" response) into "The server is shutting down -- please try again before contacting the next MX record). In this case, Symantec is definitely in the wrong. See http://www.mail-archive.com/[email protected]/msg48276.html for more details on this Symantec problem (from February -- 6 months later, they still haven't fixed their problem). 421 specifically indicates a *temporary* error per the RFCs -- Symantec is returning this when there is an error that is permanent. -Scott --- Declude: Anti-virus, Anti-spam and Anti-hijacking solutions for IMail. http://www.declude.com --- [This E-mail was scanned for viruses by Declude Virus (http://www.declude.com)] To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
