Redhat 6.0 comes with sendmail 8.9.3.  Redhat 5.2 doesn't, and
can't install the rh6.0 rpm.  So I built sendmail 8.9.3 on a redhat
5.2 machine.

This binary is pentium-II-specific, maybe.  At least, the sendmail
build command put it in a directory called "obj.Linux.2.0.36.i686".
So it might not work on a plain pentium, or a 486 or earlier.

I'd assume you can use the makemap and other stuff which came with
redhat 5.2 as part of sendmail 8.8.7.