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This article uses the term email address to refer to the addr-spec defined in RFC , not to the address that is commonly used; the difference is that an address may contain a display name, a comment, or both.
An email address such as John. Although the standard requires  the local part to be case-sensitive, it also urges that receiving hosts deliver messages in a case-independent fashion  , e.
Smith as equivalent to john. In some cases they also limit which addresses it is possible to send mail to. With the introduction of internationalized domain names , efforts are progressing to permit non-ASCII characters in email addresses.
The mailboxes may be accessed and managed by users with the Post Office Protocol POP or the Internet Message Access Protocol IMAP with email client software that runs on a personal computer, mobile device, or with webmail systems that render the messages on a screen or on paper printouts.
The general format of an email address is local-part domain , and a specific example is jsmith example. An address consists of two parts.
The part before the symbol local-part identifies the name of a mailbox. This is often the username of the recipient, e. The part after the symbol domain is a domain name that represents the administrative realm for the mail box, e.
When delivering email , an SMTP client, e. The local part of an email address has no significance for intermediate mail relay systems other than the final mailbox host.
Email senders and intermediate relay systems must not assume it to be case-insensitive, since the final mailbox host may or may not treat it as such.
A single mailbox may receive mail for multiple email addresses, if configured by the administrator. Conversely, a single email address may be the alias to a distribution list to many mailboxes.
Email aliases , electronic mailing lists , sub-addressing , and catch-all addresses, the latter being mailboxes that receive messages regardless of the local part, are common patterns for achieving a variety of delivery goals.
The addresses found in the header fields of an email message are not directly used by mail exchangers to deliver the message.
An email message also contains a message envelope that contains the information for mail routing. While envelope and header addresses may be equal, forged email addresses are often seen in spam , phishing , and many other Internet-based scams.
This has led to several initiatives which aim to make such forgeries easier to spot. To indicate the message recipient, an email address also may have an associated display name for the recipient, which is followed by the address specification surrounded by angled brackets, for example: Earlier forms of email addresses on other networks than the Internet included other notations, such as that required by X.
The format of email addresses is local-part domain where the local part may be up to 64 characters long and the domain may have a maximum of characters.
This can be useful for tagging emails for sorting, see below, and for spam control. A local part is either a Dot-string or a Quoted-string; it cannot be a combination.
Quoted strings and characters however, are not commonly used. The local-part postmaster is treated specially—it is case-insensitive, and should be forwarded to the domain email administrator.
Technically all other local-parts are case-sensitive, therefore jsmith example. Despite the wide range of special characters which are technically valid, organisations, mail services, mail servers and mail clients in practice often do not accept all of them.
For example, Windows Live Hotmail only allows creation of email addresses using alphanumerics, dot. The domain name part of an email address has to conform to strict guidelines: This rule is known as the LDH rule letters, digits, hyphen.
In addition, the domain may be an IP address literal, surrounded by square brackets  , such as jsmith [ Internationalized domain names which are encoded to comply with the requirements for a hostname allow for presentation of non-ASCII domains.
Comments are allowed in the domain as well as in the local-part; for example, john. According to RFC 2.
It is entirely up to the configuration of the mail server. Interpretation of the local part of an email address is dependent on the conventions and policies implemented in the mail server.
For example, case sensitivity may distinguish mailboxes differing only in capitalization of characters of the local-part, although this is not very common.
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