V8/usr/src/cmd/upas/send/rewrite

# a local address
^((uucp|btl)!)*[^!.@%]+$

# a uucp address
^(csnet|acsnet|bitnet|arpa)!(.+)$	"uux - -a \s research!rmail '(&)'"
^((uucp|btl)!)*([^!]+)!(.+)$	"uucproute \s \3 '\4'"	\3	\4

# anything else
^.*$ "uux - -a \s research!rmail '(&)'"