mxallowd(1) on Linux
The text 9e6f33e56c7f, as Debian 6.0 (Squeeze) shipped it.
dynamically whitelist your Mail eXchanger
Flags it lists
-
--config -
--fake-mailserver -
--foreground -
--no-rdns-whitelist -
--quiet -
--real-mailserver -
--stdout -
--whitelist-time -
-F -
-b -
-c -
-f -
-q -
-r -
-s -
-t