"Steve Werby" <[EMAIL PROTECTED]> wrote
> Renze is correct. Unless you're checking local email addresses which you
> control, there's no way to check down to that level. And be happy there
> isn't. Otherwise the amount of spam you get right now will increase ten
> fold.
I should have said there's no *reliable* way to check whether an email
address on an external server is valid. Mail servers that have the SMTP
VRFY command (and to a lesser extent the EXPN command) enabled may be able
to tell whether an email address is valid. Since many (probably most) have
these turned off and many domains have catchall email accounts installed
connecting to an SMTP server to check would not reliably tell you whether
the user supplied email address is asociated with an email account used by a
human being.
--
Steve Werby
President, Befriend Internet Services LLC
http://www.befriend.com/
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