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

"Jon Kyme" <jrk@merseymail.com> Mon, 19 May 2003 08:02 UTC

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In-Reply-To: <p06001227baeddbf491c3@[192.168.1.104]>
Subject: Re: [Asrg] Some data on the validity of MAIL FROM addresses
To: Kee Hinckley <nazgul@somewhere.com>
From: Jon Kyme <jrk@merseymail.com>
Cc: ASRG <asrg@ietf.org>
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Date: Mon, 19 May 2003 08:56:36 +0100

> 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?


Yes. I'm assuming there is no valid yahoo local part corresponding to the
message ID of the mail you sent.

220 YSmtp mta154.mail.scd.yahoo.com ESMTP service ready
helo there
250 mta154.mail.scd.yahoo.com
mail from: <postmaster@merseymail.com>
250 sender <postmaster@merseymail.com> ok
rcpt to: <p06001227baeddbf491c3@yahoo.com>
250 recipient <p06001227baeddbf491c3@yahoo.com> ok


If you wanted to, it would be easy to try this with a set of random
"local-parts".  I normally see yahoo saying "No" after DATA.






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