Mail enabling and disabling options
Options can be either binary or valued.
Binary options are either set or unset, while valued options can be set to a specific value.
Note: The form unset option is equivalent to set no option.
Use the pg command to view the /usr/share/lib/Mail.rc file. The contents of the /usr/share/lib/Mail.rc file define the configuration of the mail program. Alter the system configuration for your mail program by creating a $HOME/.mailrc file. When you run the mail command, subcommands in the .mailrc file override similar subcommands in the /usr/share/lib/Mail.rc file. The .mailrc options can be customized and are valid each time you use the mail program.
To execute mail commands that are stored in a file, use the source subcommand.
Prerequisites
The mail program must be installed on your system.