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Re: [Asrg] Some data on the validity of MAIL FROM addresses

Yakov Shafranovich <research@solidmatrix.com> Mon, 19 May 2003 01:58 UTC

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To: Kee Hinckley <nazgul@somewhere.com>, Jon Kyme <jrk@merseymail.com>
From: Yakov Shafranovich <research@solidmatrix.com>
Subject: Re: [Asrg] Some data on the validity of MAIL FROM addresses
Cc: ASRG <asrg@ietf.org>
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References: <E19HKr5-0006KK-00@argon.connect.org.uk> <E19HKr5-0006KK-00@argon.connect.org.uk>
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Date: Sun, 18 May 2003 21:55:43 -0400

At 08:58 PM 5/18/2003 -0400, Kee Hinckley wrote:

>At 10:53 AM +0100 5/18/03, Jon Kyme wrote:
>>  >
>>>  Interesting that the results vary so much by ISP.  Yahoo accounts are
>>>  pretty valid.  Hotmail accounts are pretty bad.  AOL is quite good.
>>>  Earthlink has a problem.  MSN's slightly better, but still negative.
>>
>>
>>Of course yahoo will say 250 to pretty much anything.
>>So these addresses are "valid" in what sense exactly?
>
>They said "no" to 16% of the messages I queried them on.  The specific 
>message they used was:
>
>553 VS10-RT Possible forgery or deactivated due to abuse (#5.1.1)
>
>Can you show instances in which they say yes to messages they cannot deliver?

Well they can say yes even though it cannot be delivered - see RFC 2821, 
section 3.3.

Ykaov 

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