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    According to RFC 822, the local part may contain any ASCII character, since local-part is defined using word, which is defined as atom quoted-string; atom covers most ASCII characters, and the rest can be written in a quoted-string There are syntactic restrictions, but obeying them, any ASCII character can be used On similar grounds, RFC 822 allows any ASCII character in the domain part
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    Over the years I have slowly developed a regular expression that validates most email addresses correctly, assuming they don't use an IP address as the server part I use it in several PHP programs
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    Aside from RFC 3696, the maximum length of the Path element is also specified in RFC 5321, specifically in the Section 4 5 3 1 3: The maximum total length of a reverse-path or forward-path is 256 characters NOTE: the below section was left by the original author of this answer People should be aware of the errata against RFC 3696 in particular
  • What does it mean to have RFC-compliant code? - Stack Overflow
    I have heard the term RFC-compliant code in this talk at minute 1:00 What exactly does it mean?
  • Regex validation of email addresses according to RFC5321 RFC5322
    I am however purely interested in the RFC standards For a practical approach this question is more relevant On top of comments I am willing to sacrifice folding white space, but apart from that I'm not interested in expressions that reject any addresses that are RFC5321 2-valid
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