Identifying which MTA is running

Question

I dont have knowledge on linux and how can i know which mail server is running on my linux box? Postfix/Exim? Btw Didn't found postfix folder in etc/, where can i find master.cf? .Any idea for modify cPPOP?

score 43 · Answer 1 · edited Sep 04 '16 at 21:43

43

Easiest way might be to get the PID of what's listening on port 25:

 # sudo lsof -i :25   
 COMMAND  PID USER   FD   TYPE DEVICE SIZE NODE NAME
 master  5664 root   12u  IPv4  13732       TCP *:smtp (LISTEN)

Then find out what that process is:

 # ps p 5664
 PID TTY      STAT   TIME COMMAND
 5664 ?        Ss     0:12 /usr/lib/postfix/master

And I'm running postfix. For sendmail, it looks like this:

 # lsof -i :25
 COMMAND   PID USER   FD   TYPE DEVICE SIZE NODE NAME
 sendmail 3445 root    4u  IPv4  12922       TCP localhost.localdomain:smtp (LISTEN)

Edit

Postfix config is under /etc/postfix , "sudo" might be necessary

edited Sep 04 '16 at 21:43

Community

1

answered Jan 08 '10 at 07:18

Matt Simmons

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`netstat -ltnp |grep :25` to get it all in one step. – womble Jan 08 '10 at 08:19
Good one! Much faster. – Matt Simmons Jan 08 '10 at 15:25
Here is one more oneliner: lsof -n -i :25 – Anonymous Jan 09 '10 at 22:22

score 14 · Answer 2 · answered Jan 09 '10 at 20:09

14

most mail servers will identify themselves

justin@bert ~ % telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 xxxx ESMTP Exim 4.69 Sat, 09 Jan 2010 15:08:05 -0500

answered Jan 09 '10 at 20:09

Justin

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score 4 · Accepted Answer · answered Jan 09 '10 at 20:00

4

For your second question, use locate to find master.cf

updatedb
locate master.cf

answered Jan 09 '10 at 20:00

Emil Vikström

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Identifying which MTA is running

3 Answers3