You know that Email::Valid uses this same regex, right? It's a nice piece of Perl, but even the module's own POD says:
Please note that there is no way to determine whether an address is deliverable without attempting delivery (for details, see perlfaq 9).
Of course, as I said in my other comment, validity and deliverability are two different things, and sometimes you only need one.
--
man with no legs, inc.

In reply to Re: Re: Email Validation, Round 2 by legLess
in thread Email Validation, Round 2 by TStanley

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