If the owner is having trouble getting a hold of a human at Microsoft, feel free to point them my way and I'll help get this onto the Outlook team's desk. Details in my profile.

Migadu prices like this; all the mailboxes you want and just pay by daily sending limit. ($4/mo paid annually to send 100 mails a day, for example.) https://www.migadu.com/en/pricing.html

Or if you want to pay for one mailbox somewhere and then have customized forwarding, I found this thing called Forward Email in another thread that looks interesting and I want to try setting it up self-hosted: https://forwardemail.net/#/

Oh, neat: https://www.migadu.com/en/drawbacks.html

Huge props to any service that has an honest list of reasons not to use them. I'm a little concerned that one of those things is "no SLA", though; yes, mail delivery is resilient, but if I can't access email all the time I'm gonna be grumpy.

Unlisted disadvantages are that they do not allow sending with "From" other than primary mail address (which limits usage of catch-all domains) and I had to contact them multiple times to get responses.

https://news.ycombinator.com/item?id=19946607

Beware, Migadu's biggest drawback, which is not listed, is that customer service is non-existent. You contact them about some questions and wouldn't see any responses, not even an auto reply or a ticket. It looks as if it's run by two or three people who have day jobs and other things to take care of and that Migadu is just a hobby project. Email is way too important for me (and I believe for most people), since it's the key to many online services, to let it be served by someone who's not into it full time.

Look at https://mxroute.com/

They've come in handy for a couple of my colleagues.

I took a look at it and liked it (though it doesn't seem to expand much on privacy), but the service being situated and hosted in the U.S. is something I do not prefer at this point. I wish there were services like this outside the five eyes, nine eyes and fourteen eyes countries (I know Migadu the company is in Switzerland but has its servers in France, but it doesn't seem to have adequate staff or the intention to respond to people).

Additionally, mxroute does not seem to provide any trials. Its policies say that payment issues from the customer have to be resolved within 24 hours, but that refunds to the customer may take 72 hours. That seems unfriendly to me.

I second this! I've been with them for 2 years and they've been perfect.