note 15315 modified in function.checkdnsrr by jmcastagnetto

[Editor's note: Not all email can be mathced w/ your regexp. Also a well-formed email does not assure the existence of the mailbox. Check the Internet mail RFC for more information (RFC 822), see also: http://www.imc.org/rfcs.html] how about preg_match and: $rex="/^[\w-]+(\.[\w-]+)*@\w+(\.[\w-]{2,3})$/"; if (preg_match ("$rex", "_Kla.3M-er@f.fe_" )) { print "valid email"; } http://www.php.net/manual/en/function.checkdnsrr.php