I have seen a few posts on here about members wanting to add custom domain emails so I figured I would make a post about this.
My domain register is 25cents.com they register all my domains with any domain register godday who ever its pretty much the same.
In your domain register who ever you choose most have free emails. You have access to whats called a MX and A records of any domain name through a register. you can modify those records so that you may host with webflow but you can have your email from your register.
Here is a article to get you started.