Ports 993, 587, 25 behind proxy question?

Hi all,

Currently have my IredMail server ports 993, 587 and 25 directly behind my router.

I do have the IredMail ports 80/443 behind a Ubuntu22LTS nginx proxy server that also serves Letsencrypt certs.

Would it be recommended to move 993, 587, and 25 behind same proxy? If so, Would someone have a sample proxy nginx config file that I can use to create mine?

Regards