@terrygogo try static ip from your provider.
@niko was there any error restarting cloudron-firewall service or such? This should still work as expected, so maybe you hit a bug somewhere?
Also could you share your ports.json config here so we can try to reproduce this? If you don't want to expose your port settings here, you can also send them to firstname.lastname@example.org
@girish Just as a quick add-on, if you have Comcast business class, port 25 may be allowed by calling the business support line. Same with ATT.