Yes, we HAD access to the plaintext e-mail. And we explain that and warn about that.
But after encrypting the e-mail, nobody will have access to that e-mail any more: Even hackers, phishers or the government. Many people are storing their e-mails for years in their INBOX. Great to protect those e-mails over the time.
But, anyway: The best way is always to use real end-to-end-encryption. In that case, you don't have to trust us any more. We're happy to help to set this up.