Re: Closed mailing lists

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Autor: Philip Hazel
Data:  
Para: John Horne
CC: exim-users
Assunto: Re: Closed mailing lists
On Thu, 16 Oct 1997, John Horne wrote:

> Is it possible to truly verify that a message has come from a specified user?


If it has come from outside your machine, no, unless you use encryption.
You can check the IP address of the calling host; you can check the ident
information that that host sent you, but every byte in the message
itself can be forged.

Consider the equivalent: an envelope that drops through your front door.
Is it possible to truly verify that it comes from a specified person
just by looking at its contents?

-- 
Philip Hazel                   University Computing Service,
ph10@???             New Museums Site, Cambridge CB2 3QG,
P.Hazel@???          England.  Phone: +44 1223 334714



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