Fortigate blocking random outgoing ports

[MaeIstrom]

I have a fortinet v7.0.12 router and it's configured to nat and allow all traffic from the internal network to the internet. There's a firewall rule for internal -> wan with source/destination/Service set to 'all' and the security police is no-inspect. This seems to work for most things, internal users can access web site but some outgoing connections are blocked. Notably ports 8007 and 25 don't work. Where else would these connections be getting blocked if not the firewall?

[ozkanaltas]

Hello @MaeIstrom ,

When you review forward traffic logs, can you see blocked traffic logs? 

If you are not, this traffic can be blocked by the ISP. Generally, ISPs don't like 25 traffic. Because of that, they can block 25 traffic.