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A message submission agent (MSA), or mail submission agent, is a computer program or software agent that receives electronic mail messages from a mail user agent (MUA) and cooperates with a mail transfer agent (MTA) for delivery of the mail. It uses ESMTP, a variant of the Simple Mail Transfer Protocol (SMTP), as specified in RFC 6409.[1]
Many MTAs perform the function of an MSA as well, but there are also programs that are specially designed as MSAs without full MTA functionality.[2] Historically, in Internet mail, both MTA and MSA functions use port number 25, but the official port for MSAs is 587.[1] The MTA accepts a user's incoming mail, while the MSA accepts a user's outgoing mail.
^ ab
Gellens, R.; Klensin, J. (November 2011). "Submission Identification". Message Submission for Mail. IETF. sec. 3.1. doi:10.17487/RFC6409. STD 72. RFC 6409. Retrieved November 14, 2013.
^Costales, Bryan; Assmann, Claus; Jansen, George; Shapiro, Gregory Neil (2007-10-26). sendmail: Build and Administer sendmail. "O'Reilly Media, Inc.". ISBN 978-0-596-55534-4.
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Mechanism April 2011 HTTP cookie RFC 6409 Messagesubmission for mail November 2011 messagesubmissionagent replaces 2476, 4409 RFC 6455 The WebSocket...
relayed the author's message. Most likely, the author has submitted the message through the proper messagesubmissionagent. Such message qualification can...
uses the submission protocol, a profile of the Simple Mail Transfer Protocol (SMTP), to send the message content to the local mail submissionagent (MSA)...
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Transmission Types Registration, Chris Newman, July 2004. RFC 6409, MessageSubmission for Mail, Randall Gellens and John C. Klensin, November 2011 (obsoletes...
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descriptive information is also added, such as a subject header field and a messagesubmission date/time stamp. iMails can carry international typesets and have...
URL's query string when the form submission method is GET. The same encoding is used by default when the submission method is POST, but the result is...
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