Handles remote mail received through Basic Networking Utilities (BNU).
rmail User
The rmail command interprets incoming mail received through the uucp command. It collapses From header lines in the form generated by the bellmail command into a single line of the form:
return-path!sender
The rmail command passes the processed mail on to the sendmail command. The User parameter must specify a user recognized by the sendmail command.
The bellmail command, sendmail command, uucp command.
Mail Overview for System Management in AIX 5L Version 5.2 System Management Guide: Communications and Networks.