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subdomain - 一个电子邮件 ID 允许有多少个子域?

转载 作者:行者123 更新时间:2023-12-04 15:15:27 26 4
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一个电子邮件地址可以有多少个子域?
例如:something@something.co.uk.uk像那样....

最佳答案

没有任何基于子域数量的限制。
RFC821中的电子邮件地址部分长度有限制

user

The maximum total length of a user name is 64 characters.

domain

The maximum total length of a domain name or number is 64 characters.

path

The maximum total length of a reverse-path or forward-path is 256 characters (including the punctuation and element separators).


RFC2821 中的限制

local-partThe maximum total length of a user name or other local-part is 64characters.

domainThe maximum total length of a domain name or number is 255characters.


最新在 RFC5321

4.5.3.1.1. Local-part

The maximum total length of a username or other local-part is 64
octets.

4.5.3.1.2. Domain

The maximum total length of adomain name or number is 255 octets.

4.5.3.1.3. Path

The maximum total length of areverse-path or forward-path is 256
octets (including the punctuation andelement separators).

关于subdomain - 一个电子邮件 ID 允许有多少个子域?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/5087426/

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