[spondyl]

I can recommend the folks over at Migadu (https://migadu.com) which is a small Swiss email host. Their support is very responsive and I never had any issues while there.

I was also a Fastmail customer and I can recommend them too. I actually had all of my email for the last 10 years in one mailbox (100K+) and Fastmail didn't even blink most of the time handling it.

Performing an action on every email such as setting everything to "Read" would take ~10 seconds but that's to be expected for the amount of work being done.

Currently I'm using G Suite for the additional services but I never had an issue with the two I mentioned above.

[ganlub]

Migadu works great most of the time, but it takes forever to get a reply from their support.

[newscracker]

Anecdotal: whenever I contacted Migadu (as a potential customer), it didn't seem like they were reading the messages sent to them at all. Looks like they're either heavily understaffed or their technology isn't that great. I personally wouldn't recommend it.