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OCR: INTERNET MESSAGE HANDLING ARCHITECTURE Various MTA relays EMTA Message transfer agent (MTA) Message transfer system (MTS) Internet User agent (A) Figure 1: The Simple Mail Transfer Protocol (SMTP) allows e-mail-enabled client systems, or user agents (UAs), to send messages in ASCII text to other UAs, Internet mail servers act as message transfer agents (MTAs), relying on SMTP, conventional e-mail addresses, and the domain name service database to relay the e-mail message from server to server, until it reaches the mail server that services the recipient UA.