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Subaddressing is the practice of augmenting the local-part of an [RFC2822] address with some 'detail' information in order to give some extra meaning to that address. One common way of encoding 'detail' information into the local-part is to add a 'separator character sequence', such as "+", to form a boundary between the 'user' (original local-part) and 'detail' sub-parts of the address, much like the "@" character forms the boundary between the local-part and domain.
Some mail services support a tag included in the local-part, such that the address is an alias to a prefix of the local part. For example, the address [email protected] denotes the same delivery address as [email protected] RFC 5233, refers to this convention as sub-addressing, but it is also known as plus addressing, tagged addressing or mail extensions.
The local-part of the email address may use any of these ASCII characters:
* uppercase and lowercase Latin letters A to Z and a to z
* digits 0 to 9
* printable characters !#$%&'*+-/=?^_`{|}~
* dot ., provided that it is not the first or last character and provided also that it does not appear consecutively (e.g., [email protected] is not allowed).
* uppercase and lowercase Latin letters A to Z and a to z
* digits 0 to 9
* printable characters !#$%&'*+-/=?^_`{|}~
* dot ., provided that it is not the first or last character and provided also that it does not appear consecutively (e.g., [email protected] is not allowed).
