If you need all the features of Gmail or Inbox, probably not. If you can get by with what IMAP has to offer, FastMail has been very solid for me. I pay about $50 a year for a single account, which can support lots (unlimited?) domains and addresses (both sending and receiving). The web UI is nice, and the iOS app is pretty good, too. They also blog a lot about what they are doing on the technical side, and seem really invested in the future of IMAP and open source. They have a serious focus on speed. Spam filtering I would say is like a B-, there are some really obvious things that seem to get through no matter how much I train it. Support staff has been helpful when I've needed it, though.
They are excellent! I had a feature request twice, it was implemented on their beta server within days. Their (standard-conforming) IMAP and Webmail is really fast (they cache recent stuff on SSDs). They have apps now for Android and iOS (basically wrappers around the web app with notification support, but they work well enough). They recently added CalDAV and CardDAV support.
On top of all of that, they actively contribute to open source projects such as Cyrus.
Thanks for the suggestion, I like what they're offering. I hadn't considered spam, probably because gmail is so good at it that I haven't thought about spam in years. Anyway, seems worth a shot.
Microsoft actually do a good job and you can always call someone who can actually do something. Never thought I'd say that.
However, I'm using an IMAP box on Gandi.net and a domain purchased elsewhere and that is it. I refuse to use any services tied to a single company any more.
This change has given me a lot of headspace for other things.
I have no idea about usability because I don't use the online interface, but Microsoft's Office 365 offerings are great for $5/mo. You also get unlimited OneDrive space.
It also comes with 10 minute turnaround time on phone support. You get a little popup asking if everything is okay and if you want to receive a call for support when you login to the admin interface.
I've been quite happy with it for the last three months.
I know HN frowns on "me too" responses but I am in the same boat. I'm heavily dependent on GMail right now and each time I see a story about someone having troubles on Google's non-charging (I hesitate to say "free") services I make a mental note to find a paid alternative, but never follow up.
I have my work e-mail on Zoho, but I haven't been able to free myself from Gmail... the inertia is too great (plus the integration to all the other Google services).
I do have two-factor authentication after a scare.