What is the difference between Proton’s email domains?

1 min
Addresses and identities

Proton has four different email domains that you can use to create email addresses:

  • is the default domain for Proton Mail: You’ll be asked to create a address ( when you sign up.
  • is an alternative domain that you can choose when you sign up or use to create additional addresses (
  • is our short domain: You can activate your short email address ( after you’ve signed up if you’re on a paid Proton plan.
  • is our original Proton Mail domain: If you joined Proton before 2016, you have an additional free address (

If you have a paid Proton plan, you can create additional addresses (aliases) using any Proton domain above or your own custom domain (

Learn more about types of addresses and aliases

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