ProtonMail is an open-source fully encrypted secure email service hosted in Switzerland. They provide email, storage, and VPN services. There is a free version that you can sign up for which all you need is to create a username and password. This allows anyone to create an a end to end encrypted email. they also offer paid plans which give you more storage and features. Currently, they are offering extra resources to all paid members prior to April 30, 2020. Their paid plans start at $5 per month.
Their lowest-priced paid plan is the Plus plan and comes with 5GB of storage. If you sign up now before April 30, 2020, or if you already have an account, you will get an extra 5GB of storage that you can keep for as long as you stay a customer. Normally, storage goes for an extra $1 per GB per month. That is a $60 savings a year.
Anyone with a Proton account can also download and use their fully open-source VPN for free. This is a highly rated secure VPN service that protects your privacy.
Read more about their extra resources on the ProtonMail Blog. I am not an affiliate of ProtonMail and will not receive any compensation for this service. I just really love their product and recommend it.