RE: [Asrg] Deprecating plain POP accounts

["Gary Feldman" <gaf@rtr.com>]

> From: asrg-admin@ietf.org [mailto:asrg-admin@ietf.org] On 
> Behalf Of Keith Moore
> Sent: Wednesday, March 05, 2003 6:53 PM

> this mail is originating from some earthlink.net IP address;  
> the return
> address is moore@cs.utk.edu.   it's perfectly valid for me to 
> be using that
> return address to send mail from that IP, or from any other 

How do I know it's valid?  And if I can't tell whether it's valid,
what reason do I have to accept it?  (Setting aside, for the moment,
that the mail has been passed through a list server that has
some controls.)

I can't imagine any reason why, in theory, I would ever want to accept 
mail with a return address that I can't validate.  If you want to,
that's
you're right, but that doesn't mean that other people - whether 
end-users or mail service operators - should.  In actual practice,
people
accept such mail not because they like to get invalid mail, but because
the validation mechanisms aren't in place. 

Since someday I might actually want to receive mail from someone not
able
to send from their return domain - it means that a way to validate
such emails would be useful.

Gary


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