So many unhelpful responses here… This is obviously a problem in some professional environments. Same problem with Gimp…

Sorry OP, you’re probably stuck with Cloudflare.

My domain registrar hosts my email too, so I set up a mailbox for self-hosted services to send emails from. Is this an option for you? For me I figured it would be a lot easier than setting up a mailserver myself and doing the research you’re now doing.