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mta след това се свързва с обменният сървър като smtp клиент.
)after the message sender (smtp client) establishes a reliable communications channel to the message receiver (smtp server), the session is opened with a greeting by the server, usually containing its fully qualified domain name (fqdn), in this case "smtp.example.com".
smtp става широко разпространен в началото на 80-те.
at the time, it was a complement to unix to unix copy program (uucp) mail, which was better suited for handling e-mail transfers between machines that were intermittently connected.