What is the maximum length of a valid email address?

That limit is a maximum of 64 characters (octets) in the “local part” (before the “@”) and a maximum of 255 characters (octets) in the domain part (after the “@”) for a total length of 320 characters. Systems that handle email should be prepared to process addresses which are that long, even though they are rarely encountered.

For more information see: https://www.rfc-editor.org/rfc/rfc3696.txt

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