Does the local part of an e-mail address have a minimum length requirement?

It is entirely possible to have an e-mail address with just one character. All of the guidelines are defined in RFC822: http://www.ietf.org/rfc/rfc0822.txt?number=822

The necessary REGEX: http://www.ex-parrot.com/pdw/Mail-RFC822-Address.html

0, if you don’t count quoting double-quotes. If you do, the minimum’s 1.

""@example.com

[email protected]

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RFC 5321

   Mailbox        = Local-part "@" ( Domain / address-literal )

   Local-part     = Dot-string / Quoted-string
                  ; MAY be case-sensitive


   Dot-string     = Atom *("."  Atom)

   Atom           = 1*atext

   Quoted-string  = DQUOTE *QcontentSMTP DQUOTE