Sonicwall: Route email over a specific WAN IP?

We have a sonicwall NSA2400.

Our WAN is configured with the following:

Outbound email is sent out over our default X1 IP:

How do i configure the sonicwall to route the email over the IP:

I have already created the address object for .220, but I am unable to figure out how to setup the sonicwall.
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Benjamin MOREAUConnect With a Mentor Project ManagerCommented:
Read this PDF

This PDF explain how to configure NAT four incoming AND outcoming mail.
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