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→Benefits: “M” starts with a vowel (“a MSA” to “an MSA”) |
→top: false implication that it is unknown which of two terms applies (both commas missing from clause set off by commas) |
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{{more citations needed|date=March 2017}}
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 [[Request for Comments|RFC]] 6409.<ref name="rfc6409"/>
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.{{citation needed|date=July 2016}} Historically, in [[Internet mail]], both MTA and MSA functions use [[port number]] 25, but the official port for MSAs is 587.<ref name="rfc6409">
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