Yes "Secure Mail with Protonmail" FTW! Seriously guys get Protonmail and especially if deal with any type of large amounts of emails frequently. They are perfect for people who deal with large amounts of Emails... especially if you do it on a very frequent basis they let you set up 2-Factor Authentication with your Email.
Long as you don't Send more than 150 Emails Per 24 Hours than a Free Email Account will do fine. If your looking for a VPN you can get ProtonVPN with a Paid Protonmail Account giving you access to multiple Custom Email Domain Names etc. etc.