TSQL Email Validation (without regex)

Question

Ok, there are a million regexes out there for validating an email address, but how about some basic email validation that can be integrated into a TSQL query for Sql Server

Answer 1

Great answers! Based these recommendations I came up with a simplified function that combines the best 2 answers.

CREATE FUNCTION [dbo].[fnIsValidEmail]
(
    @email varchar(255)
)   
--Returns true if the string is a valid email address.  
RETURNS bit  
As  
BEGIN
    RETURN CASE WHEN ISNULL(@email, '') <> '' AND @email LIKE '%_@%_.__%' THEN 1 ELSE 0 END
END