邮件地址可以包含国际（非英语）字符吗？

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邮件地址可以包含国际（非英语）字符吗？

如果可能的话，我应该接受来自用户的这种邮件吗？当我给这些地址发送邮件时，应该预期哪些问题？

admin 更改状态以发布 2023年5月22日
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更新2015年: 使用RFC 6532

实验性的5335已被6532取代，
后者被设置为“类别: 标准轨道”，
成为标准。

第3.2节（RFC 5322的语法扩展）更新了大多数文本字段以
包括（适当的）UTF-8。

The following rules extend the ABNF syntax defined in [RFC5322] and
[RFC5234] in order to allow UTF-8 content.
VCHAR   =/  UTF8-non-ascii
ctext   =/  UTF8-non-ascii
atext   =/  UTF8-non-ascii
qtext   =/  UTF8-non-ascii
text    =/  UTF8-non-ascii
             ; note that this upgrades the body to UTF-8
dtext   =/  UTF8-non-ascii
The preceding changes mean that the following constructs now
allow UTF-8:
   1.  Unstructured text, used in header fields like
       "Subject:" or "Content-description:".
   2.  Any construct that uses atoms, including but not limited
       to the local parts of addresses and Message-IDs. This
       includes addresses in the "for" clauses of "Received:"
       header fields.
   3.  Quoted strings.
   4.  Domains.
Note that header field names are not on this list; these are still
restricted to ASCII.

请注意明确包含的域。
和明确排除的标题名称。

关于NFKC的说明:

The UTF-8 NFKC normalization form SHOULD NOT be used because
it may lose information that is needed to correctly spell
some names in some unusual circumstances.

而第3节开始:

Also note that messages in this format require the use of the
SMTPUTF8 extension [RFC6531] to be transferred via SMTP.

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根据RFC 6532规定，国际化电子邮件地址是可以实现的 - 是的。

如需快速了解，请参阅有关主题的维基百科条目。

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