Section 21.0, Understanding Message Transfer between Domains and Post Offices
Section 22.0, Configuring the MTA
Section 23.0, Managing the MTA
Section 24.0, Monitoring the MTA
Section 25.0, Optimizing the MTA
Section 26.0, Using MTA Startup Switches
For a complete list of port numbers used by the MTA, see Message Transfer Agent Port Numbers.