From: Bojan Zdrnja (bojan.zdrnja@gmail.com)
Date: Sat Feb 04 2006 - 16:55:49 EST
On 2/2/06, Doug Fox <dfox168@hotmail.com> wrote:
> One can use NetCraft (www.netcraft.com) to identify a web server if it is
> Appache, IIS, etc.
>
> How can one identify a mail server behind a firewall, be it Exchange,
> GroupWise, or Lotus Notes?
>
> nmap or nessus helps identify if a mail server is available through tcp port
> 25.
Well, be it behind the firewall or not, port 25 *has* to be open if
you want to receive e-mail from other machines on the Internet.
Whenever you want to identify some application, you will have to rely
on banners that you see after you establish communication.
Most of the servers will nicely identify them self in the first banner
line. This can be changed and some administrators will remove all
identifying messages from the banner.
I've seen servers modified like this, but there are other small clues
you can use to identify them:
- make some SMTP errors so you see how the remote server handles it
(how it informs you of an error). You can probably make a nice table
with various SMTP servers and their error handling
- try opening connection with EHLO and try using the HELP command,
this one often gives more detail about the remote server.
Cheers,
Bojan
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