isemail

is_email() is a function to validate an email address against relevant RFCs

Checks an email address against the followings RFCs:

http://tools.ietf.org/html/rfc5321

http://tools.ietf.org/html/rfc5322

http://tools.ietf.org/html/rfc4291

http://tools.ietf.org/html/rfc1123#section-2.1

http://tools.ietf.org/html/rfc2821

http://tools.ietf.org/html/rfc2822

http://tools.ietf.org/html/rfc3696

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email address validation php function smtp rfc ietf