I'm working on open source solution https://github.com/vaulty-co/vaulty that may help with data tokenization, encryption, etc. Few cases from your blog post may be covered. I also created a guide on how to tokenize email address (it can be anything like phone number, IP, SSN, etc.) and let application use tokenized email when sending emails via Mailgun: https://vaulty.co/docs/cookbooks/email-list-with-protected-e.... Would be great to hear feedback if any :D