(a) port forward traffic to port 25 on the LEAF router to the 10.10.10.x mail serverI'm not sure if it's NAT or routed. Assuming it's NATed, and it is already setup to go from the ISP's router to 192.168.1.2, couldn't I use that address for eth0 on the firewall, and setup portforwarding to send it to the static IP of the mail server behind the firewall? This seems the simplest way to me since it only requires me to make a few changes to Dachstein and not have to have our ISP change anything at all.
(b) have the ISP router port forward port 25 to the LEAF router's "external" address.
(I'm assuming here that the ISP router NATs 192.168.1.0/24, something you haven't actually said. It is possible that the ISP actually routes to 192.168.1.0/24 rather than NATs it, and that some address translation takes place upstream of you. In that case, everything is different, and you haven't told us enough details to get good advice.)
While this approach should work, it is clumsy.
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