The problem I had while trying to install xfmail went away and it is working again. I am not sure what caused the warnings about "mmap", but all I did was remove the xforms I had installed from source, and then I made symlinks from the deb-installed libraries to /usr/lib, where xfmail expects to find the libraries. That was all I did.
The patch for xfmail seems to work, so now I can use either PGP or GnuPG with it. -- Andrew