restrict email to one domain only for registration

Hi,
I want users to use an email adress at a specific domain for registration (in order to ensure, that the user works for a specific company). Once they are registered, I want them to be able to change their email adresses to whatever email and domain they want.
When I set up a validation on the email field, this prevents users from changing their email to other domains even after registration.
What would I need to do to allow email-addresses@different.domains after registration only?

Believe the only way you'll be able to have conditional validation like that is to move the validation to PHP. You can do so using Code Validation provided by CB Code Field. Under Integrations > CB Code Field you can enable PHP based custom validation to be applied to your email field where you can then verify the email domain only for registrations. Example as follows.

Code Validation: Enable
Code (PHP): Ajax Validation: Enable

Note the above is just an example. I cannot help you with custom coding tasks. You will need to implement that verification yourself.

Thank you,
works like a charm.