[Mailman-Users] Re: mail not being sent/received

Brad Knowles brad at stop.mail-abuse.org
Fri Feb 18 18:27:16 CET 2005

At 11:27 AM -0500 2005-02-18, jpsota at gmail.com wrote:

>>  2) Your MTA is only listening your local loopback, i.e. your own machine
>>, and not your machines IP address.
>  Hmm... I'm using sendmail. Can you please tell me how I'd check to see
>  if this is the problem, and how to change it if it is?

	Try this:

% netstat -na | grep '\.25[       ]'
tcp4       0      0           *.*                    LISTEN
tcp6       0      0  ::1.25                 *.*                    LISTEN

	Or this:

% netstat -na | grep '\.25[      ]'
tcp4       0      0  *.25                   *.*                    LISTEN
tcp6       0      0  *.25                   *.*                    LISTEN

	Note that there are two white space characters between the two 
square brackets -- there is a space character, and a tab character.

	If you see output like the second example, then you have an MTA 
that is listening on port 25 on all IP addresses and interfaces, for 
both IPv4 and IPv6.  If you see output like the first example, then 
it's listening on port 25 for the IPv4 address, and port 25 
on the equivalent IPv6 address.

Brad Knowles, <brad at stop.mail-abuse.org>

"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."

     -- Benjamin Franklin (1706-1790), reply of the Pennsylvania
     Assembly to the Governor, November 11, 1755

   SAGE member since 1995.  See <http://www.sage.org/> for more info.

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