Validating e mail 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.
With the introduction of internationalized domain names, efforts are progressing to permit non-ASCII characters in email addresses.
The transmission of electronic mail within the Internet uses the Simple Mail Transfer Protocol (SMTP), defined in Internet standards RFC 5321 and RFC 5322, and extensions like RFC 6531.
Refer to our Acceptable Use Policy (AUP) for more information about how to use the service appropriately.This is often the username of the recipient, e.g., jsmith.The part after the @ symbol (domain) is a domain name that represents the administrative realm for the mail box, e.g., a company's domain name, 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.