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: John Smith .
Earlier forms of email addresses on other networks than the Internet included other notations, such as that required by X.400, and the UUCP bang path notation, in which the address was given in the form of a sequence of computers through which the message should be relayed.
An email address identifies an email box to which email messages are delivered.
A wide variety of formats were used in early email systems, but only a single format is used today, following the standards developed for Internet mail systems since the 1980s.
That’s why we built in a suggestion service into our email validation service.
Quoted strings and characters however, are not commonly used.
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.