Identification of a Mail Server

"Doug Fox" <[email protected]>
Newsgroups gmane.comp.security.penetration,gmane.comp.security.incidents,gmane.comp.security.forensics
Message-ID <[email protected]>
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.

Any info is much appreciated!

Regards,

DF

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