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

2003-05-18 19:03:37
At 08:58 PM 5/18/03 -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?


I tried this:

% head /dev/urandom | md5sum
ce4c096d881440fffebbde3b64291d92  -

% telnet mx1.mail.yahoo.com 25
Trying 64.156.215.5...
Connected to mx1.mail.yahoo.com.
Escape character is '^]'.
220 YSmtp mta124.mail.scd.yahoo.com ESMTP service ready
helo spamwolf.com
250 mta124.mail.scd.yahoo.com
mail from:<>
250 null sender <> ok
rcpt to:<ce4c096d881440fffebbde3b64291d92(_at_)yahoo(_dot_)com>
250 recipient <ce4c096d881440fffebbde3b64291d92(_at_)yahoo(_dot_)com> ok
quit
221 mta124.mail.scd.yahoo.com
Connection closed by foreign host.


Saying that <ce4c096d881440fffebbde3b64291d92(_at_)yahoo(_dot_)com> is 
unlikely to be a valid address is an understatement.

Scott Nelson <scott(_at_)spamwolf(_dot_)com>
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