Are email addresses allowed to contain non

 

I'm building a website using `Django. The website could have significant users from non-English speaking countries.

I just want to know if there are any technical restrictions on what types of characters an email address could contain.

Are email addresses only allowed to contain English alphabets, numbers, "_", "@" and "."?

Are they allowed to contain non-English alphabets like "é" or "ü"?

Are they allowed to contain Chinese or Japanese or other Unicode characters?

Email address consists of two parts local before @ and domain that goes after.

Rules to these parts are different:

For local part you can use ASCII:

  • Latin letters A - Z a - z
  • digits 0 - 9
  • special characters !#$%&'*+-/=?^_`{|}~
  • dot ., that it is not first or last, and not in sequence
  • space and "(),:;<>@[] characters are allowed with restrictions (they are only allowed inside a quoted string, a backslash or double-quote must be preceded by a backslash)
  • Plus since 2012 you can use international characters above U+007F , encoded as UTF-8.

    • Domain part is more restricted:

  • Latin letters A - Z a - z
  • digits 0 - 9
  • hyphen -, that is not first or last, multiple hyphens in sequence are allowed.

    • Regex to validate

    ^(([^<>()[].,;:s@"]+(.[^<>()[].,;:s@"]+)*)|(".+"))@(([^<>()[].,;:s@"]+.)+[^<>()[].,;:s@"]{2,})

    Hope this saves you some time.

    Well, yes. Read (at least) this article from Wikipedia.

    I live in Argentina and here are allowed emails like ñoñó1234@server.com

    The allowed syntax in an email address is described in RFC 3696, and is pretty involved.

    The exact rule [for local part; the part before the '@'] is that any ASCII character, including control characters, may appear quoted, or in a quoted string. When quoting is needed, the backslash character is used to quote the following character
    [...]
    Without quotes, local-parts may consist of any combination of alphabetic characters, digits, or any of the special characters ! # $ % & ' * + - / = ? ^ _ ` . { | } ~
    [...]
    Any characters, or combination of bits (as octets), are permitted in DNS names. However, there is a preferred form that is required by most applications...

    ...and so on, in some depth.

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