Send Plain Text E-mail
The ability to send email in plain text as an option, like gmail does. Some mailing lists require plain text so this would be very handy.
Additionally: display all emails default text-only, and manually switch to HTML only as needed.
With the ability to mantain tab characters (needed in mailing lists for open source projects like linux kernel)...
In this way it will be possible to use ProtonMail for those projects
I agree. I want to send plain text as opposed to rich text. Or at least give me control over fonts and sizes.