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What to do when a website blocks registration with SimpleLogin

Most websites and online services allow you to register with your SimpleLogin alias. However, there have been reports of some websites not accepting a SimpleLogin domain.

What to do when a Website is blocking SimpleLogin?

Report the website to:

We keep track of all the websites reported, do further testing and manually reach out the website to ask for the block to be removed.

How to know if a website is blocking SimpleLogin?

You will notice this when website is blocking you to register with your unique SimpleLogin alias. Some websites are transparent and display an error message like “This email address is not accepted”.

Other websites are sending more generic error messages or not even display any error. In that case, try registering with another email address ( or

Why SimpleLogin is not a throwaway email service?

  • You need an account to use SimpleLogin
  • All aliases generated are unique
  • Multiple anti-abuse automation
  • Anti-SPAM limitations
  • All SimpleLogin aliases is permanent, untill user will decide to delete them
  • Registration of multiple accounts on the same service by single user is not allowed by ToS

SimpleLogin is an email aliasing tool that allow users to add a layer of privacy and security while browsing online.

How to get SimpleLogin unblocked?

Another way to resolve the problem is to get your subdomain or add your custom domain to SimpleLogin (this is a Premium features).

Email template to send to websites that block SimpleLogin

To: Customer support email address

Subject: Unable to register with my unique SimpleLogin email alias


I am reaching out to seek your assistance with an issue I encountered while attempting to register my account with your service. Despite being unable to use my SimpleLogin email alias during the sign-up process, I believe the block on SimpleLogin alias on your domain might have been an oversight.

SimpleLogin has gained significant popularity among users worldwide, serving as a tool for protecting their online identities against SPAM and phishing by providing unique email aliases. This service is part of Proton AG, one of the most popular encrypted email providers.

I would like to emphasize the importance of not discriminating against users who opt for privacy-focused email services. For further information regarding SimpleLogin aliases, I recommend reviewing the official documentation at

Thank you for your attention to this matter.

Best regards,