On further thing I've done is separate the clients from the server. Since my
provider nicely provides two IP addresses in my service and I had the needed
hardware to do it, the mail server now is on a separate address from
everything else. So assuming this was something from the client side, that
should minimize the damage to the server side of things. It will complicate
making backups since I do network backups and the backup software won't work
across different subnets so I'll have to occasionally shutdown the mail
server and move the server to the client subnet.
Can your router handle multiple WAN IP addresses? If so, try letting it handle both. Then, within the router, map one of the IP addresses to the internal IP of the mail server. That's how I ran mail at my last job -- CommuniGate Pro on a Linux box behind a Netopia DSL router. We had several "real" IP addresses, one of which was mapped to the CGP box.
HTH, Tim -- Timothy Binder Director, President-Elect Philadelphia Science Fiction Society <http://www.psfs.org/> Upcoming Guests: Elizabeth Hand, Warren Lapine, James Morrow Vice Chair, Philcon 2004 <http://www.philcon.org/> Principal Guests: Brian W. Aldiss, Joe DeVito, Kevin J. Anderson & Rebecca Moesta, Jolly R. Blackburn & Brian Jelke, Tom Purdom
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