Simple sendmail configuration on Redhat 6.5
Hi All, having a bit of a nightmare getting sendmail to work on a redhat 6.5 client. Basically I want it to forward on all external emails to a smart relay, so I've updated the DS line to point to my smart relay and restarted sendmail. This has worked for many years on multiple different OS's but not on this one at this time.
I've disabled postfix, removed postfix, removed sendmail, re-added sendmail, re-configured sendmail, verified DNS, ran a "telnet smartrelay 25" and can get connectivity, but whenever I try sending an external mail it trys to route it internally and then I get a return email saying it can't resolve the external email addresses. Has something fundamental and basic changed because this configuration works on multiple other clients I support. Here is the returned mail: Message 2: From MAILER-DAEMON@hostname.blah.blah Tue Apr 21 17:07:58 2015 Return-Path: <MAILER-DAEMON@hostname.blah.blah> Date: Tue, 21 Apr 2015 17:07:58 +0100 From: Mail Delivery Subsystem <MAILER-DAEMON@hostname.blah.blah> To: root@hostname.blah.blah Content-Type: multipart/report; report-type=delivery-status; boundary="t3LG5R9o017225.1429632478/hostname.blah.blah" Subject: Returned mail: see transcript for details Auto-Submitted: auto-generated (failure) Status: RO Part 1: The original message was received at Tue, 21 Apr 2015 17:05:27 +0100 from root@localhost ----- The following addresses had permanent fatal errors ----- -c (reason: 550 5.1.1 <-c@hostname.blah.blah>... User unknown) (expanded from: -c) -f (reason: 550 5.1.1 <-f@hostname.blah.blah>... User unknown) (expanded from: -f) ----- Transcript of session follows ----- 451 remotehost.com: Name server timeout 451 anotherremote.com: Name server timeout ... while talking to [127.0.0.1]: >>> DATA <<< 550 5.1.1 <-f@hostname.blah.blah>... User unknown 550 5.1.1 -f... User unknown <<< 550 5.1.1 <-c@hostname.blah.blah>... User unknown 550 5.1.1 -c... User unknown 451 remotehost.com: Name server timeout 451 anotherremote.com: Name server timeout Part 2: Content-Type: message/delivery-status Part 3: Content-Type: message/rfc822 From root Tue Apr 21 17:05:27 2015 Return-Path: <root> From: root <root> Date: Tue, 21 Apr 2015 17:05:27 +0100 Any suggestions gratefully received as I'm beginning to loose the will to live with this one... Thanks Sic |
Quote:
It sounds as if you want to use/enable the mailertable feature: https://www.sendmail.com/sm/open_sou...lertables.html ...which will let you select the host mail goes to, depending on the domain. This has an explanation a bit simpler to follow: http://www.cyberciti.biz/faq/force-s...or-mailserver/ |
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