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Re: checklink: Is it Possible to Enable mailto link validation?

From: Dag-Erling Smørgrav <des@des.no>
Date: Tue, 30 Jun 2009 15:54:09 +0200
To: Etienne Miret <elimerl@gmail.com>
Cc: www-validator@w3.org
Message-ID: <86y6r925fi.fsf@ds4.des.no>
Etienne Miret <elimerl@gmail.com> writes:
> Of course not. However this is not required in order to check for an
> email adress. The following SMTP transaction tests two gmail addresses
> (mine and a bogus one) without sending any mail :
> [...]
> This doesn't work with all domains. For example, Yahoo! will always
> answer "OK" to the RCPT TO command, and report an error only after an
> email has actually been sent. However, this is a postfix feature, so I
> guess it works quite well.  [...]

This is not "a Postfix feature"; there are plenty of MTAs out there that
intentionally do not give any indication of the validity of an email
address until after you've transmitted the message itself.  For
instance, this is the default (and IIRC non-optional) behaviour of
QMail.  They do this for the same reason they do not implement VRFY: it
makes it harder for spammers to verify that an address is valid and
therefore spammable.

Dag-Erling Smørgrav - des@des.no
Received on Tuesday, 30 June 2009 13:54:46 UTC

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