I'd suggest going through https://www.privacytools.io/#email https://www.privacytools.io/#email. These providers won't give your data to NSA or third party comp

I'd suggest going through https://www.privacytools.io/#email https://www.privacytools.io/#email. These providers won't give your data to NSA or third party companies(or at least this is more likely, than with another provider like google). Given you are asking for some sensitive data, I'd suggest you use one of these, at least for this specific project if you can't make the move completely.