I second Fastmail wholeheartedly. I moved multiple self-hosted (Postfix and Dovecot) environments to Fastmail and haven’t looked back. The only thing I lost was the ability to manually configure an address to bounce back.
Sending and receiving as a wildcard alias is fantastic, and Fastmail allowing that was the reason I finally moved. I held out on that feature for a long time. (You can also do this in Exchange Online if you want to run a convoluted and officially unsupported configuration.)
I only twice had any kind of RBL issues, and one was a motivating factor in moving. I also got tired of worrying about patching and CVEs. I do that enough for my work.
One of the reasons I decided to self-host emails for my domain names. There's no reason it should be hard to host your own email in 2024 even if you're just mildly technical.
An Ansible playbook that sets up Debian to host email, all the dependencies from the default Debian repositories.
