In order to use DELIVER, you must first take two steps:

    1. Create a MAIL.DELIVERY file in your default login directory.
       For security reasons this file must be located in your default
       login directory - it cannot be stored elsewhere. The format
       of a MAIL.DELIVERY file is described under the subtopic
       "MAIL.DELIVERY File format".

       This first step is all that is required to cause DELIVER to
       process mail delivered to you by PMDF. That is, the presence
       of a MAIL.DELIVERY file is all that is required to activate
       DELIVER for messages you receive via PMDF.

    2. Set your mail forwarding address to "IN%""~USERNAME"""
       (OpenVMS 7.0 or earlier) or to IN%"~USERNAME" (OpenVMS 7.1
       or later) where USERNAME is your username. Refer to the PMDF
       User's Guide for further information on using the SET FORWARD
       command.

       This step is required to cause DELIVER to process mail you
       receive in your VMS MAIL mailbox by means other than PMDF.

    Once these two steps have been taken, DELIVER will be invoked
    automatically to handle all mail as it is delivered to you. For
    example, suppose the user BOB on an OpenVMS 7.0 system wants to
    have DELIVER process his incoming messages. BOB should create
    a MAIL.DELIVERY file in his login directory and then set his
    forwarding address,

 $ MAIL
 MAIL> SET FORWARD "IN%""~BOB"""
 MAIL> EXIT
 $