I was unable to use my SimpleLogin email alias during the sign-up process or to link my existing Netlify account. Below are the domains SimpleLogin is currently using:
The block of SimpleLogin alias on your domain must be a mistake. Hundreds of thousands of people globally use SimpleLogin to protect their identity online against SPAM and phishing by using a unique email alias. SimpleLogin has been acquired by Proton, the leader of encrypted email use by tens of millions of users.
I believe it’s important not to discriminate against users who prefer a privacy-focused email services.