On Oct 25, 2010, at 6:46 PM, Daniel P. Brown wrote:

> On Mon, Oct 25, 2010 at 18:38,  <web...@blaettner.com> wrote:
>> Is there any other function which checks whether this
>> address really exists?
>    Of course not!  Can you imagine the implications, insecurities,
> and privacy concerns that would be associated with that?  Some
> mailservers will confirm or deny if a local address exists, but not
> most --- thankfully.
Not true or else you would never get mail. What you mean is that most 
mailservers have VRFY disabled
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