I've been using Protonmail for a year now, and I'm very happy with it. I have several domains on it. The mobile apps are decent (I have iOS and Android), and

I've been using Protonmail for a year now, and I'm very happy with it. I have several domains on it. The mobile apps are decent (I have iOS and Android), and the web app is fine. It's not perfect, but given their limited resources compared to Google I'm quite impressed.