D.3 Post Office Protocol v3 (POP3)
SMTP is only useful as a transport protocol between mail servers. It does not deliver mail to a user’s mailbox, nor allow remote users to retrieve mail from the server. Local delivery is a function of the mail system in use. For example, cc:Mail uses a disk-based postoffice to store mail for each individual user on that system. An SMTP server for cc:Mail would accept messages on behalf of the cc:Mail users, but would not necessarily deliver that mail to the user. The cc:Mail postoffice server would likely handle the local delivery independently of the SMTP gateway.
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