Force SMTP (25) out on particular WAN

[robatwork]

I am in a bit of a state of confusion around policy routing. Would be grateful if someone can give me an example of a rule that will achieve the following - I have read the manual and several posts here and given this several attempts with no joy so far.

I have 3 WAN connections and 1 LAN.

Setup an Exchange server and want to force it to only send SMTP out on WAN1.

Here's what I have done

1. Setup a gw group called SMTP on Wan1 to be WAN1 Tier1, WAN2 and WAN3 Never. Trigger level Member Down

2. Setup a floating rule as follows:
   PASS
   IF: LAN
   Direction: OUT
   IPv4
   TCP
   Source ANY
   Dest From Other SMTPport to Other Other SMTPport

ADvanced/Gateway: SMTP on Wan1

So - all this does is block SMTP coming IN!

Changed rule to be IF: WAN1 instead of LAN and although SMTP comes in, it doesn't force SMTP out on this rule.
So now I don't know if I'm coming or going with in and out - I have gone snow blind with it.

Many thankis for any help.

[robatwork]

Cheeky bump - anyone?  :)

[Fabio72]

I'm using the following rule in lan allowing to send email only to my ISP smtp using my ISP gateway