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Old 09-08-2008, 04:10 AM   #1
Registered: Jul 2004
Location: VIC, Australia
Distribution: RHEL, CentOS, Ubuntu Server, Ubuntu
Posts: 363

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Question Sendmail using lower priority MX

Emails sent to a particular domain ( is always using the lower priority MX which happens to be down and so the emails are not getting delivered.

From my server:
[root@mx1 ~]# host -t mx mail is handled by 50 mail is handled by 10

[root@mx1 ~]# mailq
                /var/spool/mqueue (18 requests)
-----Q-ID----- --Size-- -----Q-Time----- ------------Sender/Recipient-----------
m887bl45020906      704 Mon Sep  8 13:38
                 (Deferred: Connection refused by

/var/log/maillog shows no connection attempt made to the higher MX at all.

I can connect to the higher priority MX but not the lower 1 from the server:
[root@mx1 ~]# telnet 25
Connected to (
Escape character is '^]'.
220 ESMTP server of Telnet Communication Limited (Telnet). Sending Unsolicited Commercial or Bulk E-mail or SPAM to/from TELNET Computer Network is Strictly Prohibited. Any Attempt Of This Type Of Abuse Will Cause From Termination Of Network Connectivity Up To Activity Of Law Enforcement Agencies.
221 2.0.0 Bye
Connection closed by foreign host.

[root@mx1 ~]# telnet 25
telnet: connect to address Connection refused
telnet: Unable to connect to remote host: Connection refused
Any advice?

Last edited by the_gripmaster; 09-08-2008 at 04:13 AM.
Old 09-08-2008, 04:36 AM   #2
Registered: Oct 2007
Posts: 71

Rep: Reputation: 15

check whether is listening to port 25.

netstat -nap | grep smtp
If active, check your firewall if it allowing port 25.
iptables -L
Old 09-08-2008, 04:41 AM   #3
Registered: Jul 2004
Location: VIC, Australia
Distribution: RHEL, CentOS, Ubuntu Server, Ubuntu
Posts: 363

Original Poster
Rep: Reputation: 38
It's not actually a firewall issue. I called up and they said that their lower priority MX server has been deliberately shut down.

So, what else could be the problem?

Last edited by the_gripmaster; 09-08-2008 at 06:58 AM.


mx, priority, sendmail

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