Topic Last Modified: 2007-01-24

When a message is copied to the Pickup directory or comes in through the designated TCP port, it is put in the Queue directory. The default TCP port is port 25.

If the recipients are local, the message is delivered. If the recipients are not local, the message is processed for remote delivery. Figure 1 shows the message flow proccess.

Figure 1 omits the recommended presence of one or more firewalls between the Internet and the SMTP Server.

The message flow process
Figure 1   Message flow process