Dennis Peterson wrote:

> How are able to determine that? There's nothing in the connection 
> information or in the message that identifies the source OS, hardware, 
> or MTA. Everything in a message can be spoofed as can the sending 
> system. The only thing you can be sure of is the IP you log during the 
> connection. Nothing else can be considered real.

P0f maybe?  Although with my experience it has never been that accurate
and is easy to fool if one so desires.
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