Send mail through separate internet connection

I have a t1 and a dsl line with static ip
I have a firewall connected to the t1 that does all my NAT and is
setup in as the network gateway.int address 10.100.10.254
my dsl router is connected in parrallel with the firewall and has a
internal address of 10.100.10.200
I want to be able to send mail out through my dsl router and dont know
how.

1. do I just change the gateway on the exchange server to
10.100.10.200
and create a 2nd mx record with higher priority pointing to the
external address of the dsl router.

Any help would be appreciated

.

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