page/create_account, email: *"protonmail.com" ONLY restriction

I need to restrict all new/create_account to only email addresses *@"protonmail.com" users. Do not want to allow pollution of system and other via gmail, or the rest.  Could put it in Dolphin easy enough, but have not been able to discover how to incorporate the user message "Requires 'protonmail.com' email", and test to confirm *@"protonmail.com" address. All I find is path to page/create_account, but no folder for "page", or file create_account.  Under Dolphin did not have to access and code on the actual page. 

https://spnwo.com/ssl/una/page/create-account   < "page/create-account" can not find folder or file.

Thanks, Robert

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    • Hello Sovereign People New World Order !

      You may use the solution form this thread https://una.io/page/view-discussion?id=2335 

      • Thanks LeonidS, Wish could do it like in Dolphin. Much cleaner when you can NOTICE the user and give them a link to www.protonmail.com so they can create that before completing the Sign-UP part, and it tests for "@protonmail.com" and sends a rejection, retry, message if need be.

        From other inquiries, that may be a good, helpful, needed function to code or design into the create-account code. Anyone there can do it, and how much? Shouldn't be that difficult, basically have 1 flag (use the feature or not) 2) enter in domain(s) (one or more) to accept or reject separated by comma.

        Anyway, trust all is going well. Have a good week. Thanks again. Robert

        • Thanks LeonidS, Wish could do it like in Dolphin. Much cleaner when you can NOTICE the user and give them a link to www.protonmail.com so they can create that before completing the Sign-UP part, and it tests for "@protonmail.com" and sends a rejection, retry, message if need be.

          From other inquiries, that may be a good, helpful, needed function to code or design into the create-account code. Anyone there can do it, and how much? Shouldn't be that difficult, basically have 1 flag (use the feature or not) 2) enter in domain(s) (one or more) to accept or reject separated by comma.

          Anyway, trust all is going well. Have a good week. Thanks again. Robert

          Hi Sovereign People New World Order - if you would like to discuss customization, please send me a PM

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