On Oct 23, 2009, at 10:48 AM, Jonathan Billings <billi...@negate.org>  
wrote:

>   If the mail system couldn't figure out who you were
> asking for, it would generate an SMTP failure with a list of possible
> matches in the error, so you'd get a bounce with useful information in
> it.

Sounds like the stuff a spammers dreams are made of.
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