Coinbase Commerce - Accept BTC, ETH & other digital currencies in your business
Spark Mail - Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues
Coinbase - Bitcoin, safe and easy.
Newton Mail - Newton is a fully featured mail client available for Android, iOS, macOS and Windows.
Accepting - All the places that let you pay with Bitcoin
Aqua Mail - Android Mail Client.