How to get SCO MMDF to add From: user (Real Name)?

[David J. MacKenzie]

MMDF on our SCO Unix 3.2.2 system doesn't add a line like this:

From: djm (David MacKenzie)

How can I get it to do so?  Right now there's no indication of the
sender's real name.  We're just using it for local and uucp delivery.
--
David J. MacKenzie <djm at eng.umd.edu> <djm at ai.mit.edu>