SVR4 version of rmail has domain address support. Just adding to your list.
--
-- Andy Crump
...!tektronix!reed!littlei!andyc | andyc at littlei.intel.com
...!uunet!littlei!andyc | andyc at littlei.uu.net
Disclaimer: Any opinions expressed here are my own and
not representive of Intel Corportation.