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Uplink Balancing question

My system is Sophos UTM Home version 9.107-33

I originally had one DSL connection with a static IP address. I run an IceWarp mail server that has been connection to the Internet via one of the DSL static IP addresses. The MX record points to that public IP and Email was being sent and received without a problem. I added a 2nd WAN connection that is DHCP (Cable). It is 5 times faster than the dsl and I want to take advantage of the speed.

I enabled Uplink Balancing and that gives my systems much quicker speed over the new connection. Problem is that outbound smtp connections from the mail server to the internet are also using the faster uplink connection and outbound emails are in many cases being blocked by spamhaus-pbl. 

How can I force the mail server to connect outbound via the DSL WAN connection that has the static IP?

Any help would be appreciated.


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