SELECT *
FROM Subscribers
WHERE NOT
(
CHARINDEX(' ',LTRIM(RTRIM([Email]))) = 0
AND LEFT(LTRIM([Email]),1) <> '@'
AND RIGHT(RTRIM([Email]),1) <> '.'
AND CHARINDEX('.',[Email],CHARINDEX('@',[Email])) - CHARINDEX('@',[Email]) > 1
AND LEN(LTRIM(RTRIM([Email]))) - LEN(REPLACE(LTRIM(RTRIM([Email])),'@','')) = 1
AND CHARINDEX('.',REVERSE(LTRIM(RTRIM([Email])))) >= 3
AND (CHARINDEX('.@',[Email]) = 0 AND CHARINDEX('..',[Email]) = 0)
)
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