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We found that all SMTP traffic (outbound and inbound) was being directed to our mailserver.
Disabled NAT reflection for the SMTP PF rule, and it started working.
Don't know why 17.7 worked with NAT reflection enabled globally and 18.1 doesn't.
Thanks again.

Thanks, I'll look at that.

So, 17 works, but 18.1 fails, yet both systems have exactly the same settings.
Is this a problem with NAT?
Any hints would be welcome.

no difference :(

Will be trying it later, our backup box is still on 17.6

Sorry realised i need to install and then update

There only seem to be 18.1 images available, will they be the 18.1.6 release now?
Our install shows as 18.1

18.1
Thanks for the quick reply, I will download that now :)

We are running 17.1, but are trying to upgrade to 18.1.
However on the new firewall, when we install it and restore the config from 17.7, our internal Exchange server cannot connect outbound to other SMTP connections.
What has changed that might cause this?
I have tried telnet to an external mail server on port 25, and that fails to connect as well.
incoming mail, web and  SIP connections etc, all seem fine.