SMTP Server
The SMTP server sends and receives mail from other Internet hosts using the Simple Mail Transfer Protocol (SMTP). The SMTP server processes incoming and outgoing mail. Outgoing mail is spooled until the SMTP server can confirm it has arrived at its destination. Incoming mail is spooled until users access it using a POP3 or IMAP4 mail client. Spooling allows the transfer from client and server to occur in the background.
You can use settings to secure your SMTP server from unwanted use. See see "SMTP Security". for more information.
