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How to find out what email program is running on my server.
https://forum.linode.com/viewtopic.php?f=11&t=9184		 Page 1 of 1
Author:  wai_user [ Tue Jul 24, 2012 7:35 pm ]
Post subject:  How to find out what email program is running on my server.
Is there anyway to find out what email program is being used on a server whether it's sendmail, postfix, exim or whatever?
Author:  AGWA [ Wed Jul 25, 2012 12:41 am ]
Post subject:  Re: How to find out what email program is running on my serv
Try running
Code:
telnet localhost 25
on the server. The mail server should reply saying what software it is. For example, sendmail would reply with this:

Code:
$ telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 zeus.example.com ESMTP Sendmail 8.14.4/8.14.4; Tue, 24 Jul 2012 23:37:32 -0500


If that doesn't work you can run
Code:
ps -ef
to get a list of running processes, and look through the list for exim, sendmail, postfix, etc. You can pipe that to the grep command to search for a particular process, like this:

Code:
$ ps -ef |grep sendmail
root      1672     1  0 Jun10 ?        00:00:39 sendmail: accepting connections       
smmsp     1675     1  0 Jun10 ?        00:00:00 sendmail: Queue runner@00:25:00 for /var/spool/clientmqueue
root     13028  1672  0 21:37 ?        00:00:00 sendmail: server localhost [127.0.0.1] cmd read
Author:  obs [ Wed Jul 25, 2012 1:58 am ]
Post subject:  Re: How to find out what email program is running on my serv
You could also run netstat -lpnt and see what's listening on port 25
Code:
netstat -lpnt
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      2026/master     
tcp6       0      0 ::1:25                  :::*                    LISTEN      2026/master   


In this case postfix shows as master
Author:  wai_user [ Wed Jul 25, 2012 1:51 pm ]
Post subject:  Re: How to find out what email program is running on my serv
Thank you Agwa, that was very helpful.
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