MTAREG.EXE should be used by registered users. Registered users who
upgrade MTA from a version 15.10/20 to a version 15.21 or higher can
use this program ONCE.

The program must be run with 2 parameters, the first pointing to the
MTA.CTL file (full drive, directory and filename) and the second to
the MTA.KEY file (full drive, directory and filename). After MTAREG
has run succesfully, you should get a message about what to do with
the REGISTRATIONNAME option and MTA/M/L should display a more proper
screen from the start of the program !

MTAREG.EXE will generate a new file (MTA.KEN) which should be in the
same directory as the MTA.KEY file (and should stay there). After you
have created this file (with MTAREG) you can delete MTAREG.EXE and
this documentation.