Use ntfy.sh. It’s open source and has a free server.

Disclaimer: I made it ;-)

Thank you for contributing to the magic of the old school internet.

My question: How does one get to write an RFC? Do you have to become part of a certain group, or just be known in certain circles, or do you just start writing and then submit it somewhere? If I had a great idea that I think should become an RFC, what is the process to make this a reality?