Help Needed: My RHEL5 box suddenly stopped accepting e-mails

Bohdan Sydor bohdan at
Sat May 7 20:27:24 UTC 2011

On 05/07/2011 10:09 PM, Mun wrote:

> I get "connection lost" or "Connection timed out"; depending on the computer
> I use to run telnet.
> The "connection lost" is what my Windows XP box returned; and the
> "Connection timed out" is what
> another Linux box returned.

Please log in as root and run the following commands:

service sendmail status

chckconfig --list sendmail

netstat -ntlp | grep :25


grep -v '^#' /etc/hosts.{allow,deny}

We'll be able to see which process is listening on smtp port and if it's
not being blocked by either the packet filter, nor tcp_wrappers.


Bohdan Sydor

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