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What characters are allowed in an email address?
See RFC 5322: Internet Message Format (http://tools.ietf.org/html/rfc5322) and, to a lesser extent, RFC 5321: Simple Mail Transfer Protocol (http://tools.ietf.org/html/rfc5321).

RFC 822 also covers email addresses, but it deals mostly with its structure (http://tools.ietf.org/html/rfc822#section-6.1).
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In addition to ASCII characters, as of 2012 (https://tools.ietf.org/html/rfc6531) you can use international characters above U+007F (http://www.utf8-chartable.de/unicode-utf8-table.pl), encoded as UTF-8 (https://en.wikipedia.org/wiki/UTF-8#Description).

For validation, see Using a regular expression to validate an email address (https://stackoverflow.com/questions/201323/using-a-regular-expression-to-validate-an-email-address).
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february 2018 by dusko
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