Try this It checks DNS MX records as well as performing SMTP level validation http://www.daniweb.com/code/snippet217131.html L.M. Arun http://twitter.com/437341 > Try this > http://www.tienhuis.nl/php-email-address-validation-with-verify-prob > Thx, I tested it. Only partially works. It says that bobm at dottedibiz > is valid, but also so is applepie at dottedi.biz, or anything else that > doesn't break syntax criteria. It seems to validify domain only. > I have links to several others that I googled to test, but some are > documented for the tech community, and miss the target on simple > testing/implementation, thus I need to read deep.