Love mailbox.org. Had it for 5 years at this point. I have a custom domain, and a wildcard address, so anything before @ goes to my inbox. So whenever I sign up for anything I use a unique email. This way I know both where mails are coming from, and can easily block any compromised email addresses, and update my password. Good stuff!

Happy customer of Mailbox for 3 years here! At first the UI was awful, but now they have redesigned it very, very nicely. Yes you have to pay but the price is completely fair, particularly if you are a heavy email user.

UI aside, I have had 0 issues with them. I have a custom domain, so I can create many aliases. Being able to sync my contacts and calendar via WebDav thanks to Mailbox instead of having to use a Google account is a great plus. On the computer I use their website, but many people prefer Thunderbird. On my phone and tablet I use FairEmail (I'm a big fan of the dev. That man is on the road to create the most flexible email app in the universe).

They offer a full suite with Drive, Notes, Calendar... But I don't use them much, so I can't comment on them.

wanna add to the pile recommending mailbox.org. switched to their standard plan (4 eur a month, but you can go lower) recently exactly because of this whole mess and i have absolutely no regrets. finally got to use my domain for email and setting up a handful of aliases was a breeze. been getting good use of their caldav/webdav integrations, too.