[pkulak]

10 accounts sounds like there are actually lots of aliases, which would be free.

Regardless, I’m a happy Fastmail user as well, just to add another anecdote.

[divbzero]

Yes, Fastmail accounts correspond to the number of users you have. Each user can set up a virtually unlimited number of aliases.

I have also been a happy Fastmail user. Reliable and easy to configure.