Hello again, On Friday 22 February 2008, Arno wrote: > On Friday 22 February 2008, FM wrote: > > some customer have problem sending email to us. > > > > When they tested using telnet : > > [EMAIL PROTECTED] bfreebody]$ telnet mail.LEXUM.UMontreal.CA. 25 > > Trying 132.204.136.52... > > Connected to mail.LEXUM.UMontreal.CA.. > > Escape character is '^]'.mail.LEXUM.UMontreal.CA > > 220 gw-mail.lexum.umontreal.ca ESMTP > > helo mail139.messagelabs.com > > 250 gw-mail.lexum.umontreal.ca Ok. > > mail from:<[EMAIL PROTECTED]> > > 417 DNS lookup failure: bell.ca. Try again later. > > ^] > > telnet> quit > > > > > > What is courier-mta doing when user had the mail from ? I supposed it is > > a dns lookup but of which fqdn ? > > Hmm, afaik a MX-record must be a hostname, not an alias (CNAME).. > $ host -t mx lexum.umontreal.ca > lexum.umontreal.ca mail is handled by 10 mail.lexum.umontreal.ca. > lexum.umontreal.ca mail is handled by 20 smtps1.umontreal.ca. > lexum.umontreal.ca mail is handled by 20 smtps2.umontreal.ca. > $ host mail.lexum.umontreal.ca > mail.lexum.umontreal.ca is an alias for gw-mail.LEXUM.UMontreal.CA. > gw-mail.LEXUM.UMontreal.CA has address 132.204.136.52 > > Change mail.lexum.umontreal.ca to an A-Record in your DNS and you're good > to go. > > Sorry, don't remember the RFC for this, but I'm pretty sure that this is > your problem.
On further consideration, think that this is _one_ problem... But maybe not what's causing the trouble. I get the following (rather old courier 0.53.2): $ telnet localhost 25 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 hadante.dyn.bmit.de ESMTP helo mail 250 hadante.dyn.bmit.de Ok. mail from: <[EMAIL PROTECTED]> 250 Ok. I'm just guessing (I didn't look at the code), maybe it's related to the fact that you need a tcp-dns-query to look up a valid ip-address a mx record for bell.ca? $ host -t mx bell.ca bell.ca mail is handled by 10 cluster3.eu.messagelabs.com. $ host cluster3.eu.messagelabs.com. [snip a lot of hosts] ;; Truncated, retrying in TCP mode. [snip some more hosts] Using bind-tools-9.4.1_p1 (gentoo) I didn't look at the courier-code, but maybe that's part of the problem? (Sorry, If I'm barking up the wrong tree, Sam) -- Regards, Arno ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ courier-users mailing list [email protected] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
