How to add a custom domain through iOS/Android app

At this moment adding custom domains is not available through our iOS and Android Application. We are working on adding this in the future.

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  1. Benjamin III Lester

    As a native Android app developer of 5 years, I am curious about the limitations that prevent accounts with “custom” domains – domains other than – from being accessed on mobile devices via your app. I am familiar with PGP, DES, Android privileges etc. and some legal issues regarding encryption and intellectual property yet I cannot imagine any root cause behind why I cannot use my new account on my mobile device.

  2. ProtonMail Support

    You would log in to sub-user accounts the same way as when using the web client, using the entire custom domain address. If you are having a different issue, please contact our support team at or using the support form at

  3. Sergei

    Hello how can I add one more custom domain? I have alredady 10/10 can I add one more?

  4. ProtonMail Support

    To add more than 10 custom domains, you will need to upgrade to our Professional plan. Using the Professional plan you can add up to 50 custom domains.

  5. Tyson

    How do I connect my domain to my ProtonMail account????
    Can I connect my private emails???

  6. ProtonMail Support

    Please contact our support team using the support form at

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