IP Pools - Multiple WAN' s

[NathanMcGee]

I have two WAN connections with multiple IP' s. I am hosting an email server behind a Fortigate and using two VIP' s, one for each wan. Recently our primary IP on WAN1 got put on a blacklist due to malicious software. I resolved the problem by creating a static NAT IP pool and setting the outbound policy for the email server to use this. My problem is that this only works for WAN1 and now if WAN1 goes down, due to the static NAT outbound mail wont be routed through WAN2. My ideal goal is to use the same secondary IP' s for inbound and outbound mail as well as allowing the traffic to fail over between the WANs. Is this achievable in a Fortigate or am I looking at this all wrong? Thanks.