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A addresses email (called sometimes email address or addresses email , even wrongly addresses e-mail or mel ) is a Character string identifying a box of existing Email on a Data-processing network like Internet. The email address is the principal means to identify a person on Internet: provided with his email address, one can send an email to him.

The email address is sometimes confused with the Adresse Web, which is the address of a Web site. There exists still many other types of Internet addresses.

Denominations

The article Email specifies the recommended use of the word email to indicate the document conveyed by a system of Email.

To indicate the address (transmitter or of the recipient), name recommended is email address or addresses email .

False the Abbreviation mel. (for email ) was proposed by the General delegation with the French language and the languages of France to prefix an email address on a calling card or a heading of letter, as one uses Tel. to indicate a number of Téléphone. A deformation of this one gives sometimes place to the unsuitable use addresses mel .

Format

General information

The addresses of Email used on Internet are coded in a very limited number of characters, subset of the ASCII. A special coding called UTF-7, especially used in Asia, makes it possible nevertheless to represent all the characters Unicode by using only the authorized characters.

They are consisted of the three following elements, in this order:

  • a local left , generally identifying a person (lucas, Jean.Dupont, joe123) or a name of service (info, vente, postmaster);
  • separating character @ (arroba), meaning “with” or “at” in English;
  • a Domain name generally identifying the company lodging the electronic box (yahoo.fr, hotmail.com, gmail.com).

Domain name is used to identify the mail server to which a message via the protocol Simple Mail Transfer Protocol must be conveyed (smtp). The transformation of domain name into Adresse IP is done thanks to the system of resolution of names DNS.

The local part is as for it local with this waiter and identifies the box as such. The same local part can thus exist on two different waiters, and joe25317@gmail.com is not the same address as joe25317@hotmail.com. The interpretation of this identifier is made freely by the waiter. For example, it is the waiter which decides if it distinguishes the capital letters from the tiny ones.

Bonds towards email addresses can be inserted in Web pages thanks to the protocol Mailto of URL.

To specify the recipient, one will indicate the name of the recipient followed by the email address surrounded by squares. Example: Marc Dupont < md118@exemple.fr>

Several email addresses can be put in the same line, separated by semicolons. Example: Marc Dupont < md118@exemple.fr>; hddp@nivuniconnu.md; Pete < Pete@Pete.df>

Exact syntax

The RFC 3696 (and its errata) summarize the syntax of the email addresses. It is based on the RFC 2821 and RFC 2822. Many applications do not support the whole of the valid addresses or accept nonvalid addresses. Only the letters without accent, the figures and the point are very common.

Valid examples of addresses:

  • Abc@example.com
  • Abc.123@example.com
  • user+mailbox/department=shipping@example.com
  • !#$%&'*+-/=? ^_ `. ~@example.com
  • "Abc@def" @example.com
  • "Fred Bloggs" @example.com
  • "Joe. \ \ Blow" @example.com

Invalid examples of addresses:

  • Abc.example.com
    • the character @ lack.
  • Abc.@example.com
    • the character . is not inside the local part.
  • Abc..123@example.com
    • the character . appears twice of continuation.

Disguise against the Junk email

To prevent that their address can be recognized by a Robot of indexing collecting addresses at ends of Pollupostage , certain people disguise their address when they give it in a Web page or a message on Usenet, for example:
  • joe25317@NOSPAMgmail.com when it is necessary that the address preserves a valid format of address;
  • joe25317 At gmail com when it is enough that the address is recognizable by human.

See too

References

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