I use DuckDuckGo's email proxy service, you can sign up for one custom email and generate any amount of temporary-use addresses for the ones you don't trust to stop spamming when you ask them to. The purpose of their system is to be the address you sign up with, and they do their best to strip trackers and garbage, and forward it onto an email of your choice. You can change the forwarding email at any point, so it can be incredibly useful for a transitioning period.

I use Mailcow dockerized for a home domain, it is actually a very acceptable price for me being able to:

• Control my own DNS rules (it was a nightmare trying to use DuckDNS for an mailserver because of the rules you need to set)
• Run through a reliable service because DuckDNS occasionally went down, making my domain unreachable and breaking external access of any server I run
• Have a personalised public home for myself, if I ever want to make blogs or provide public services or something

I used a very lovely and helpful YouTuber's guide for it, Opentaq (here)