tuta.com is the best end to end email encryption provider in the world.
FREE and premium sevices.
https://tuta.com/pricing
Data that
tuta.com encrypts end-to-end...
Emails, including subject lines and all attachments
Entire calendars, even metadata such as event notifications
Entire address book, not just parts of the contacts
Inbox rules / filters
And the entire search index.
Some people think that both sender and recipient must have Tuta for
the email to be encrypted, not so. Only the sender needs Tuta but
the recipient must give the sender a password which the recipient uses
to decrypt the message when notified in their inbox that there is a
secure message to be opened. The recipient can read and reply (encrypted)
to the sender.
Of course if both parties are using Tuta then there would be no need
for passwords, just your login password for Tuta.com and use just like
normal email software.
Don't delay, you know it's right so do it now:
https://tuta.com/pricing
Stay safe, stay encrypted!