Sonicwall rule to push all outbound smtp traffic to specific server

i have an e5500, and would like to save myself from having to reconfigure a ton of clients outlook smtp server settings after an ISP change.

Ideally i'd like to redirect any outgoing traffic on port 25 so that it points to our ISP's new SMTP server.

Right now, I have a route setup so that any smtp traffic destined to the old ISP's server gets pushed out through the interface that's still connected to the old ISP, but that's getting shut off in a couple days.

Any help is appreciated. Haven't quite managed to wrap my head around this one.
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inspirednetworksAsked:
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wullieb1Commented:
Change your route to send all email for port 25 to the new ISP.

My preference would be to add a NAT policy that does it for you. Should be something like this

Source
Source - LAN Subnets
Translated - IP or FQDN of sending server, probably your external IP address.

Destination
Original - IP Address of receiving server
Translated - Original

Service
Original - SMTP
Translated - Original

Interface
Inbound - Any
Outbound - Any
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inspirednetworksAuthor Commented:
Thanks, I'll check it out in the morning.
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inspirednetworksAuthor Commented:
I've attached two screenshots

working - this is the routing rule that i've got that is successfully routing mail that is destined to the old mail server through the old ISP (X1)

notworking - this is the nat policy where i'm attempting to route all outgoing port 25 traffic to the shaw (new isp) mail server (mail.shaw.ca) on its X5 interface.


note: I didn't try these rules at the same time, i deleted the routing rule then enabled the nat policy and tried sending mail through both mail.metrobridge.net (old) and mail.shaw.ca (new) .... the mail.metrobridge.net failed but the mail.shaw.ca worked.
the routing rule works for both now, but once we cancel our X1 line, it wont.
working.png
notworking.png
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wullieb1Commented:
You might actually be better changing the route statement if it is working.

How are your clients configured for sending email at the moment?
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