Problem: How to validate specific email domain with forms
Solution: Well - Toolset Forms offers hook for validating the post before you save it. You can use Form hook cred_form_validate to validate your form.
You can find the proposed solution, in this case, with the following reply: https://toolset.com/forums/topic/split-how-to-validate-specific-email-domain-with-forms/#post-1203558
Relevant Documentation: => https://toolset.com/documentation/programmer-reference/cred-api/#cred_form_validate
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This topic is split from https://toolset.com/forums/topic/need-to-validate-unique-values-in-post-field/