Protonmail is an easy to use secure email service with built-in end-to-end encryption and state of the art security features.
Here is a video introduction and walk through of setting up a Protonmail account:
Below is a link to protonmail to go set up your own account. I highly recommend setting up one of these accounts especially if you are using email through a service provided by a provider like Apple, Google or Yahoo. These services are all monitored regularly by the NSA and shared with all the intelligence agencies and anything you are sending or receiving through them is part of your surveillance profile. It is not very hard any more to change that, spend a few minutes upgrading your privacy.
Links mentioned in the video for reference: