Force port on email server

[SFM]

I have a mail server on my DMZ.
The DMZ is locked down so only things I want to go out can.
I have Advanced outbound rules set so my mail server uses its real ip when it talks to mail servers.

I can recieve emails without any issues.
I can send emails if I open the DMZ up to allow anything out.
When I lock down the DMZ to only allow DNS, SMTP etc my mail server will not send.
I look at the logs and it looks like it is trying to send mail under different ports not the SMTP 25 port.

Is there a way in Advanced outbound rules (or somewhere else) to make all outbound email use port 25?

Thanks,

[sullrich]

Check out the static-port option.

[SFM]

so if I check the static port box will this do the trick?

I don't find any documentation on this is there any?

[sullrich]

No documentation yet on this, feel free to write some.