You can also turn on the RemoteAddrNotInNetwork mailet filter, and prevent
people from outside of your network (or even from off of localhost) from
sending e-mail except to people known to your server.
One of my thoughts to handle roaming e-mail is to use SSH tunneling. I can
prepare a key pair for roaming users. They can automatically login to a
special smtp account, providing access to localhost:stmp. Their mail client
would be configured to send via localhost. If they are already using
localhost, they can configure a different port for the tunnel.
--- Noel
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