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Network Security Security-Basics
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Re: Verifying E-Mail Addresses

Subject: Re: Verifying E-Mail Addresses
Date: 25 Oct 2006 04:24:02 -0000
No, that is not possible. You can not query such things against domain that 
doesn't belong to you. Also if you can do such things, it is a security issue 
for the remote domain (i.e. you can build a positive dictionary as a result 
much after).

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