Removing metadata when sending e-mails (headers)

[4jNsY6fCVqZv]

Prerequisites

• [x] I have searched open and closed issues for duplicates.

Feature

Is your feature request related to a problem? Please describe. Metadata's not so nice. The less metadata is generated in such a sensitive context as mail, the better the user can be protected.

Describe the solution you'd like Before the email is sent, all (headers) metadata is removed, as far as this is reasonable and technically possible.

Existing work I know that for example the email provider Tutanota offers this feature and that they also realize it via their clients. Unfortunately I don't know the technology well enough yet, so some research might be necessary to realize this feature.