The one thing that did work with ProtonMail was DNS records for custom domains and Buttondown newsletters… unfortunately FastMail is being more difficult about this.

This is now one of those issues that is too much to handle. Thank god email subscribing is coming to Micro.blog.

@jsonbecker My previous set-up with PM didn't easily carry over to FM specifically with regard to it also working for using custom domains in Buttondown. But as with all things DNS, I think it'll be fine once I go back in there and work on it with fewer distractions and whatnot.