I have a domain name.

It uses gmail servers and specific ports.

I cannot get it to work in windows 10 mail but it works just fine in windows live mail where there is actually a place to input the ports.

I have tried a couple suggestions from others but it just won't work in windows mail.

It is the only address I am having trouble with and it works in live mail just fine.

How do I indicate the correct ports for the pop and smtp servers when there appears to be no place to input them?

Hi,

Could you tell us what's error message or symptoms when you use the Mail App?

Based on my test, I could add the Gmail account in the Mail app that coming with Windows 10. 

Now I would like to suggest you disable your Windows Firewall and ant third-party security software to see if it's port issue.