Penetration Testing: Re: Identify the make and model of a Mail Server

[Devdas Bhagat <devdas () dvb homelinux org>]

On 01/02/06 11:30 -0500, Doug Fox 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?
Send it a mail to an obviously non existent address. Read the headers of
the bounce.
Connect on port 25, and issue non SMTP commands. Read the SMTP greeting 
banner.

Devdas Bhagat

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