We currently have 2 ironmail boxes, v6.7.1, setup with static routes configured for mail.
While configuring the new 7.x email gateways I've spotted this is now done by DNS which is a bit of an issue for us as not everything in our mail routes is in DNS, and wont be for the forseeable future.
Currently the mode is set to a stantard bridged mode, but I've been looking over transparent bridged mode and the 3rd mode (explicit proxy?) and the function doesn't seem to come under that either as far as I can see.
Was hoping there might be some people out there who have a similar setup and may of already come across these challenges before?
The mail can still be configured to route via static IP entries. The backend of the system does use a DNS server, but that is separate from the DNS severs that run on your network. The configuration allows for entering whatever information is needed for your environment.