What is an Email Address?


An email address is a Internet identifier for:



The inbox email identifier contains:



Email server may support the addition of tag after the local-part where the local part and the tag are separated by a + or -

This tag then serves generally for routing or analytics purpose.


[email protected]

The email provider or SMTP server must support email tags. To check, just send an email to [email protected] is delivered to the email [email protected].

Sender vs Author

An address can be specified as:


As for URL, you can also rewrite an email address, meaning that the email will be delivered to the email server but at another email address.

Examples of address rewriting 1) :

  • Transform an incomplete address into a complete address.
username -> [email protected]
username@hostname -> [email protected]
  • Replace an address by an equivalent address.
sending: [email protected] -> [email protected]
receiving: [email protected] -> [email protected]
  • forwarding: Replace an internal address by an external address. Example: When sending mail from a home computer to the Internet.
[email protected] -> [email protected]
  • Mailing List: Replace an address by multiple addresses. For example, replace the address of an alias by the addresses listed under that alias.


See Email - Address Validation


See What is a Mailing List?

Documentation / Reference

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