Is there a way to get courier to do destination based masquerading? In other words, to append one domain to the from addresses if I send mail to a host in the local network, but another if the destination is outside the LAN.

So far as I can tell, it always appends the contents of the _me_ file to my from address.

For example: if I send mail to the outside world, I would like the from line to show us...@domain.com. However, it I send mail from hosta to hostb on domain.com, I would like the from line to show us...@hosta.domain.com. That way, if a user on hostb replies, it will be sent directly to hosta not to domain.com. If I send mail to the outside world, hosta.domain.com is usually not visible and replies must go to domain.com.