A E-Mail address actual like already the name says - the address of a E-Mail, thus briefly said the indication, which makes possible the receiver for a E-Mail clearly designation and thus a feed to this receiver. A E-Mail address, how it is used for transport by smtp in the Internet, consists of two parts: A local part, in English local part mentioned and a global part, in English domain part mentioned. With the E-Mail address info@wikipedia.org wikipedia.org is the Domain, info. of the local part. Other transportation mechanisms like e.g. UUCP or X.400 uses another address syntax.

The local part

Local part the part of a E-Mail address is called, which the address designates within a Domain clearly. The local part must be neither identically to a user account (account), still related to an individual person.

The local part must be relative one "“domain"” clear character string. This character string may do 2822 only letters and numbers after RFC as well as determined further indications contain: A-Za-z0-9.! ^_ `{|} ~. Other indications, like e.g. Blanks, can be used, if local part is included into double stating lines or the indication by a reverse diagonal stroke (\) is masked (e.g. "”, @: ;). Comments can be inserted within round clips likewise. All indications above the ASCII-Code 127, thus also umlauts, are generally forbidden. At the beginning and end of the character string no point may be.

However falsely is very often assumed in E-Mail addresses only letters, numbers, point and and/or underlined occur may - above all forms for Web binds rejects therefore valid addresses frequently as invalid. This should be considered with the choice of a E-Mail address.

Local part and Domain are separated with (non-local) enamels according to RFC 2822 by the RK character (@), that is colloquially also called "„commercial at "“, "„ape ear "“or "„ape tail "“.

Some E-Mail offerers offer the plus addressing in such a way specified. A E-Mail on benutzer+ordner@domain automatically, without having to define a rule, into between "“+"” and "“@"” indicated files sorted. If the file is missing, the E-Mail lands nevertheless in the post office entrance.

Case

According to the RFC 2821 is to be differentiated between large and lower case with the local part. Since however the confusion developing from it and the problems are too large, there is hardly a Provider, which actually differentiates Hans@example.com between hans@example.com and. Accordingly expresses itself also the RFC:

"„The local part OF A mailbox MUST treated as case sensitive. Therefore, smtp implementation MUST take care ton preserve the case OF mailbox local parts. Mailbox domains acres emergency case sensitive. In particular, for some of host the user "“smith"” is different from the user "“Smith"”. However, exploiting the case sensitivity OF mailbox local parts of impedes interoperability and is discouraged. "“

The domain part

To the domain part the Syntaxregeln of the Domain Name service apply: A domain part can thereafter only from the indications A-z, 0-9 as well as "“-"” and "“."” exist.

With the introduction of the international Domain names Domain names may contain also 92 special characters outside of the pure ASCII-Code, e.g. German umlauts. This IDN must be translated by the E-Mail program however by means of a Punycode regulation into a ACE stringer (ASCII Compatible Encoding). From Mueller e.g. becomes xn--mller kva. From technical view nothing changes in E-Mail traffic by IDN: All indications above the ASCII-Code 127, thus also umlauts, remain forbidden in a E-Mail generally and must be coded. Since 2006 not yet all E-Mail programs Punycode can code and decode conditions automatically, one should examine before the employment whether all communication partners with the Umlautdomains to get along and/or whether one wants to accept the problems developing from it.

Length of the E-Mail address

There is no definite length delimitation for the E-Mail address. Since however an excess length of the address can lead to technical problems, RFC recommends 2821 that the local part is to have maximally 64 indications. The Domain should be long maximally 255 indications. From it results a maximum length of 320 indications including @.

Role account

Important local parts for E-Mail addresses are the Role accounts described in RFC 2142. Role account is one from the English taken name for give up or function-dependent E-Mail address. Contrary to personbound E-Mail addresses one is to the sender with an Role account always equal lasting contact address at the disposal, independently of vacation, illness, work time or job rotation of a person. Role accounts are passed on frequently over Mail distributors to one or more persons.

The most important Role accounts are:

• abuse for abuse messages
• to contact Web master around the operator of a Website
• postmaster for problems concerning the Mailempfang and/or - dispatch
• host master for name server problems
• new master for the responsible person of a new server

Wegwerf e Mail addresses

Wegwerf e Mail addresses are E-Mail addresses, which are to be used only temporally limited. These addresses are used with priority, in order to avoid Spam. They are used among other things in forums, Chats and other sides, at which with a registration a E-Mail address is required. In some cases the addresses purge after a certain time automatically, in others them are not logged out or simply no more are not used.

See also

• E-Mail
• Header (E-Mail)
• RFC 2822 - Internet Message format
• RFC 2142 - MAILBOX NAMES FOR COMMON SERVICES, ROLES AND FUNCTIONS

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