If you have a domain where those drawbacks aren't showstoppers, you might also look at Yandex hosted email. Can't beat the price (free), it has decent storage (10GB) and the limit for sending is 500/day[1].
Those drawbacks are also valid for any other small provider. Fastmail also has the problem of mails classified as spam. Really any service except the biggest 3-4 have occasional reputation problems.
The difference is just that Migadu is honest about it.
If you have a domain where those drawbacks aren't showstoppers, you might also look at Yandex hosted email. Can't beat the price (free), it has decent storage (10GB) and the limit for sending is 500/day[1].
See: https://domain.yandex.com/domains_add/
[1]https://yandex.com/support/mail/spam/sending-limits.xml