电子邮件ID允许多少个子域? [英] How many sub-domain are allowed for an Email Id?
问题描述
一个电子邮件地址可以有多少个子域?
例如:something@something.co.uk.uk
那样....
基于子域计数没有任何约束.
中的用户
用户名的最大总长度为64个字符.
域
域名或号码的最大总长度为64个字符.
路径
反向路径或正向路径的最大总长度为256个字符(包括标点和元素分隔符).
限制
本地部分 用户名或其他本地部分的最大总长度为64 字符.
域 域名或号码的最大总长度为255 字符.
,并且是 RFC5321
中的最新版本4.5.3.1.1. 本地部分
用户的最大总长度 名称或其他本地部分为64
八位字节.4.5.3.1.2. 域
a的最大总长度 域名或数字是255个八位字节.
4.5.3.1.3. 路径
a的最大总长度 反向路径或正向路径为256
八位字节(包括标点和 元素分隔符).
How many subdomains are possible for an Email address?
For Example: something@something.co.uk.uk
like that....
There isn't any constraints based on subdomain count.
There is limitation of lengths parts of e-mail address in RFC821
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).
limitations in RFC2821
local-part The maximum total length of a user name or other local-part is 64 characters.
domain The maximum total length of a domain name or number is 255 characters.
and newest in RFC5321
4.5.3.1.1. Local-part
The maximum total length of a user name or other local-part is 64
octets.4.5.3.1.2. Domain
The maximum total length of a domain name or number is 255 octets.
4.5.3.1.3. Path
The maximum total length of a reverse-path or forward-path is 256
octets (including the punctuation and element separators).
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