[validation] What is the maximum length of a valid email address?

The other answers muddy the water a bit. Simple answer: 254 total chars in our control for email 256 are for the ENTIRE email address, which includes implied "<" at the beginning, and ">" at the end. Therefore, 254 are left over for our use.

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How to check for valid email address? What characters are allowed in an email address? What is the maximum length of a valid email address?