Limitations

   There are no known bugs in PMDF's DELIVER subsystem at this time.
   However, there are a few minor nuisances which users should be
   aware of:

   1. It is difficult to debug MAIL.DELIVERY files since there is
      no way to watch deliver process the file except by enabling
      debug code in DELIVER (which is not an option normal users
      can exercise). However, the L action can be used to create a
      log file of the DCL commands DELIVER executes on behalf of the
      user when processing a message:

      ! Log commands executed in a file unconditionally
      * * * A L DELIVER.LOG
      * * * A E @DO_SOMETHING.COM

      Such log files are always placed in the user's home directory.
      Also note that output from command files invoked by DELIVER
      can be captured in a file by using the /OUTPUT qualifier:

      ! Execute a command file with logging
      * * * A E @DO_SOMETHING.COM/OUTPUT=DO_SOMETHING.LOG

      DELIVER does watch for users sending messages to themselves
      and then tries to be somewhat more informative than is usual
      about any errors it finds in MAIL.DELIVERY files.

   2. Much of the line and symbol processing done by DELIVER
      uses 252 character buffers. In particular, parameters in
      MAIL.DELIVERY files are limited to a maximum of 252 characters
      each. Most lines processed by DELIVER are limited to PMDF's
      usual 1024 character maximum. Lines output to command files
      are a special case; DELIVER must respect DCL's builtin 256-
      character line length limit. This might impose even more
      severe restrictions on symbol assignments and other commands
      than DELIVER does.

      DELIVER silently truncates lines rather than complaining about
      line lengths.