How to check whether email /domain exists

Wed Apr 3 05:38:48 EST 2002

* Oleg Broytmann <phd at phd.pp.ru> [2002-04-03 13:17 +0400]:
> On Wed, Apr 03, 2002 at 10:33:31AM +0200, A wrote:
> > What is the simplest way how to check 
> >  whether a given email address( or domain for this email) exists?
> 
>    Send a mail and ask the user to reply or click an URL.

Or send him a HTML mail that has an img tag downloading an image from the net
(1 pixel transparent GIF is enough) >:-)

Which is a good reason to not enable HTML mail in your mail client at all.

Gerhard
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