Outgoing mail starts when the user invokes an MUA, such as mail(C) or scomail(XC) to compose a mail message, or when incoming mail is accepted for routing through the local host to another destination. How MMDF handles outgoing mail is illustrated in ``Outgoing mail''.
A mail message is sent using this procedure:
For example, you send a message with this ``To:'' line:
To: andrei@your_company.comThe submit program looks in the appropriate MMDF configuration table for your_company and builds the fully qualified domain name; for example:
volga.your_company.comNow, submit determines the appropriate channel to use to send the message. In this example, all messages in the your_company.com domain are sent to the outside world on the UUCP channel, so submit puts the message in the UUCP channel queue. Then deliver picks up the message and passes it to the channel program. The channel program transfers the message out of the MMDF mail system and into the UUCP subsystem where it is queued and sent via UUCP.