[Cialug] What mail server is it running?

[Matt Patterson]

If the server is actually running, one way you can tell is to type the following...

telnet localhost 25

Often times you will see something like the following in the banner....

220 spamdump.solinus.com ESMTP Sendmail 8.13.4/8.13.4; Fri, 21 Jul 2006 11:17:53 -0500 
(CDT)

or 

220 miq-beta.solinus.com ESMTP Postfix

You should recognize Sendmail and Postfix as the MTAs from those examples.  However, you 
may only get....

220 mjp2.dyndns.org ESMTP


Many, if not all, of the popular MTAs out there will support the HELP command.  

For sendmail you will get something along the lines of.....
214-2.0.0 This is sendmail version 8.13.4
214-2.0.0 Topics:
214-2.0.0       HELO    EHLO    MAIL    RCPT    DATA
214-2.0.0       RSET    NOOP    QUIT    HELP    VRFY
214-2.0.0       EXPN    VERB    ETRN    DSN     AUTH
214-2.0.0       STARTTLS
<snip>


For Qmail you will get....
214 netqmail home page: http://qmail.org/netqmail


There are a lot of various MTAs out there.  But the most popular ones seem to be SendMail, 
Postfix and Qmail on the Unix side of things.  

I hope that this helps you out.

-Matt Patterson




On Fri, 21 Jul 2006 10:11:13 -0600 (CST), "Nathan C. Smith" <smith at ipmvs.com> wrote:
> 
> If you are logged into a machine you haven't been on before, how do you tell
> what mail system (MTA) the machine is running?  - what process names do you
> look for?  How do you tell which ones) are installed if they are not
> running?  What files or directories?
> 
> Thanks.
> 
> -Nate
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