What is this error message?

Posted on 2004-10-21
Medium Priority
Last Modified: 2013-12-15
I tried to setup pop3 server. My OS is Fedora 2.

Everything seems fine. But, if I sent an email to the user of the POP3 server, it did not reach there. I checked in the mail log and the following error messages appeared:

SYSERR(root): mail.abc.com. config error: mail loops back to me (MX problem?)
abc.com did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
DSN: Local configuration error

Any idea what the messages are? How to solve it?

Any easy to setup POP3 server available?

Question by:ccjong

Assisted Solution

ITG-SSNA earned 800 total points
ID: 12372287
This usually happens when the MX pointer in the DNS system points back to itself.

Please post the output of the following commands:

cat /etc/hosts

cat /etc/resolv.conf

netstat -plutn

Also try dig to spot DNS problems.

shell>dig type=mx mydomain.com

Chances are either your local network resolution, hostname, or DNS for mail are incorrect. In most cases where I've seen the MX loop issue, the person is running the DNS and MAIL on the same box.

Let me know if this helps you,


~K Black
Irvine, Ca.
LVL 40

Accepted Solution

jlevie earned 1200 total points
ID: 12372796
That error occurs when the mail server doesn't believe that it is the mail server for the domain, but it sees that the MX record does point to itself. This can be caused by incorrect network configuration where the hostname or the hosts file is incorrect or by failing to list all names the server is known by in /etc/mail/local-host-names.

The hostname of the machine needs to be the FQDN of the server (e.g., in /etc/sysconfig/network "HOSTNAME=mail.abc.com"). And the hosts file should contain:     localhost.localdomain localhost     mail.abc.com mail

/etc/mail/localhost-names would then contain:


Author Comment

ID: 12382104
Thanks for the help.

Featured Post

The new generation of project management tools

With monday.com’s project management tool, you can see what everyone on your team is working in a single glance. Its intuitive dashboards are customizable, so you can create systems that work for you.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Fine Tune your automatic Updates for Ubuntu / Debian
Often times it's very very easy to extend a volume on a Linux instance in AWS, but impossible to shrink it. I wanted to contribute to the experts-exchange community a way of providing a procedure that works on an AWS instance. It can also be used on…
Learn how to navigate the file tree with the shell. Use pwd to print the current working directory: Use ls to list a directory's contents: Use cd to change to a new directory: Use wildcards instead of typing out long directory names: Use ../ to move…
This demo shows you how to set up the containerized NetScaler CPX with NetScaler Management and Analytics System in a non-routable Mesos/Marathon environment for use with Micro-Services applications.
Suggested Courses
Course of the Month4 days, 10 hours left to enroll

601 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question