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-   -   How to tell what mail system your running on Linux! (https://www.linuxquestions.org/questions/linux-newbie-8/how-to-tell-what-mail-system-your-running-on-linux-729183/)

yanghwanim 05-28-2009 05:32 PM
How to tell what mail system your running on Linux!
 
Hi,

I am trying to figure out if I am running Qmail, exim, postfix, etc. Or basically what mail system my Linux box is running. Anyone now how I would figure this out? I am running a CentOS 5 box.

Thanks in advance!!!

anomie 05-28-2009 05:45 PM
I don't know of a way to reliably determine which MTA (among the variety you mentioned) is active, but you can look for clues by checking: installed packages, config files, executing processes, etc.

In the case of CentOS 5, by default it is sendmail.

yanghwanim 05-28-2009 05:55 PM
Quote:
Originally Posted by anomie (Post 3555903)
I don't know of a way to reliably determine which MTA (among the variety you mentioned) is active, but you can look for clues by checking: installed packages, config files, executing processes, etc.

In the case of CentOS 5, by default it is sendmail.
I see that sendmail is installed, however I also see Qmail running, and is located @ /var/qmail, very complicated, but fun.

chrism01 05-28-2009 07:11 PM
As root at cli:

alternatives --display mta

alternatives --config mta

yanghwanim 06-01-2009 01:54 PM
Quote:
Originally Posted by chrism01 (Post 3555960)
As root at cli:

alternatives --display mta

alternatives --config mta
Dang Chris!! That worked like a charm! I bow down to you Jedi-Masta! Thanks again!

farslayer 06-01-2009 02:08 PM
Just in case the alternatives command doesn't work for you (doesn't work on my system for instance) you can use netstat

Code:
it-lenny:~# netstat -alnp | grep :25
tcp        0      0 127.0.0.1:25      0.0.0.0:*    LISTEN    3654/exim4

chrism01 06-01-2009 06:21 PM
Yeah, that's specific to RH based systems I believe, but the config option makes it easy to switch between mtas to see which one you prefer.


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