Procmail is located in the following directories for each platform.
OSF = $HOME/bin/osf/bin
Sol = $HOME/bin/sol/bin
Sol X86 = $HOME/bin/solx86/bin
Put all binaries into one directory. Use a script named procmail, and
name the binaries according the invocation of the script (eg.:
procmail-sun4u-5.6 for a Solaris 2.6 version on Ultra class machines).
You may not even need the "uname -m" part for procmail, not too sure.
$ cat procmail-script
#!/bin/sh
exec $0-`uname -m`-`uname -r` "$@"
$
Or rename the directories accordingly.