<P> 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 . This article uses the term email address to refer to the addr - spec defined in RFC 5322, not to the address that is commonly used; the difference is that an address may contain a display name, a comment, or both . </P> <P> An email address such as John.Smith@example.com is made up of a local - part, an @ symbol, then a case - insensitive domain . Although the standard specifies the local part to be case - sensitive, in practice the mail system at example.com may treat John. Smith as equivalent to JohnSmith or even as johnsmith, and mail systems often limit their users' choice of name to a subset of the technically valid characters . In some cases they also limit which addresses it is possible to send mail to . </P> <P> With the introduction of internationalized domain names, efforts are progressing to permit non-ASCII characters in email addresses . </P>

What is the part of the email after the @ called
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