What type of validation could ensure that the domain of an email address is @mendix.com?

The choice indicating "Not equals, not required" may initially seem like a means to control domain validation, but it doesn't effectively guarantee the integrity of a specified email domain. The correct approach involves determining which email addresses are allowed based on their domain.

Validation that ensures an email address ends with a specific domain, such as @mendix.com, requires an equality check with the suffix of the email address rather than a "not equals" condition. This is critical because you want to confirm that the email address being assessed is indeed from the @mendix.com domain.

A more appropriate validation strategy would involve an "equals" condition that checks if the email address has the exact ending of @mendix.com, ensuring that only email addresses from that specific domain are accepted. This validation would be essential to enforce rules in various contexts, such as ensuring that only employees or affiliated users can register or access certain functionalities.

Thus, implementing the correct validation based on the equality check directly addresses the requirement by allowing only email addresses that match the specified domain.