You don't need to be a big three, but yeah, you need some staff if you want things to "just work". Fastmail and other providers deal with it day in and out and

You don't need to be a big three, but yeah, you need some staff if you want things to "just work". Fastmail and other providers deal with it day in and out and have enough reputation that a single spammer from their IP doesn't impact everyone else. Keep your domain, outsource your mail service. Plus fastmail is just all around a cool company so, yeah I mean, who wouldn't want to support small local business that love open source and do 'the right thing' when it comes to their customers and really care about how email works, and how it's evolving.