![]() The server queries the DNS for any mail exchanger records ( MX records) to find the IP address of a designated mail transfer agent (MTA) for that address. A mail server will use the Domain Name System (DNS), which is a distributed database, to find the IP address of the host of the domain. It is not clear from the email address domain name what is the actual destination (the mailbox host) of an email. The general formats of an email address is It consists of two parts: the part before the sign is the local-part of the address, often the username of the recipient ( jsmith), and the part after the sign is a domain name to which the email message will be sent ( ). Mailboxes themselves are most often accessed using the Post Office Protocol (POP) or the Internet Message Access Protocol (IMAP), though the use of webmail(where the mailbox contents is rendered in a client browser by HTML) is becoming more common. ![]() The transmission of email over the Internet normally uses the Simple Mail Transfer Protocol (SMTP), defined in Internet standards RFC 5321 and RFC 5322, and extensions like RFC 6531. ![]()
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