The message below is from the admin at the school where our mail is being returned undeliverable. What do you think ?
-----Original Message----- From: James Ford [mailto:[EMAIL PROTECTED]] Sent: Friday, December 14, 2001 1:21 PM To: Cris Porter Subject: Re: FW: [IMail Forum] FW: Undeliverable Mail #1 On Fri, 14 Dec 2001, Cris Porter wrote: >I going to send you a few msgs containing a conversation >I've had ongoing at the I-mail forum about our undeliverable messages. >Let me know what you think. Arcadia (all schools under "tusc.k12.al.us" for that matter) have three MX records for their domains: arc.tusc.k12.al.us. 4H IN MX 5 www.arcadia.tusc.k12.al.us. arc.tusc.k12.al.us. 4H IN MX 10 arcadia.tusc.k12.al.us. arc.tusc.k12.al.us. 4H IN MX 20 ns1.tusc.k12.al.us. The first two MX records will never be accessible (207.79.237.11) via SMTP (port 25) or POP (port 110) - this is by design. Mailers will (should) query a DNS server, get a listing of all MX records for a site, and attempt to rotate thru the MX records for delivery. >From your log snippets, it appears that your mailer first attempts to connect to www.arc.tusc.k12.al.us (port 25 is blocked) and upon not getting an SMTP connection just quits. >20011212 095516 127.0.0.1 SMTP (2016) Connect arc.tusc.k12.al.us >[207.79.237.11:25] (1) >20011212 095518 127.0.0.1 SMTP (2016) 421 SMTP service not available, >closing transmission channel Any attempt to connect to port 25 (ie, telnet www.arc.tusc.k12.al.us 25) will not happen - it would be the same as attempting to telnet to an IP address with no machine on it. Thus the 421 error is _not_ being returned by www.arc.tusc.k12.al.us but rather by something else - I suspect the program running at 127.0.0.1 If a connection fails then 127.0.0.1 should query DNS, see all MX records involved, and round-robin down until all MX records have been tried. Your localhost guy (127.0.0.1) closes the initial connection attempt without attempting to go to any other MX records. >> X-RBL-Warning: This E-mail was sent from a mail server with no reverse DNS >> entry. Any "X-insert-header-here" is a descriptive header only. People use it for filtering but it has nothing to do with RFC2821 (replaces RFC821) and RFC2822 (replaced RFC822). Please visit http://www.ipswitch.com/support/mailing-lists.html to be removed from this list. An Archive of this list is available at: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/
