Yea, I haven’t played with it too much. You’ll ever have to host your own SMTP server to send it or use gmail or protons SMTP service.
Doing it yourself might cause big companies to send your mail to spam or possibly just drop the packets cause you’re not using a trusted IP, have the wrong DNS settings, etc. and your ISP may even block port 25
This can be circumvented by using a SMTP relay service but can still have some issues like mail sending limits.