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Find out how to identify and correct common sign-in issues like problems with your username and password, account locks, looping logins, and other account access errors.
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.