ubuntu – Setting up a home email server using postfix

I have an extra desktop at my house that I want to turn into a email server with postfix and dovecot. I did set it up and can send internal emails on my subnet, 192.168.2.0/24. I configured the postfix configs as well.

The problem was when I tried to connect to the telnet socket and send an email to an exterior domain and it wouldn’t let me forward the email outgoing. I linked my domain name to my router and then port forwarded port 25 on my router and then internally linked port 25 to the desktop computer.

Just wondering is there anything else I would have to configure or setup, is this a good stack am I missing any tool or software to get the email server going I didnt think it would be that hard just set up the server and what not.

Appreciate any advice