Guide to Unix/Explanations/Mail Server Overview/Outgoing mail

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Outgoing mail is first written to a spool directory on the client machine[edit]

Outgoing mail produced by the mail client is first written to a spool directory.

Mail Submission Agent[edit]

The mail submission agent takes mail from the spool directory and forwards this to the listening mail transport agent on the mail server via SMTP.

Delivery[edit]

The mail transport agent forwards the mail to the internet service providers SMTP server for delivery or delivers the mail directly if the recipient is local.

A copy is placed in the sent items folder[edit]

The mail transport agent places a copy of the mail into the users sent items folder on the mail server.