Hi Team, using Salesforce Marketing Cloud Next forms, we need pre-submit validation on the email field (e.g. block gmail.com). CRM Lead validation works only post-submit. Does MC Next support native validation? If not, what is the recommended approach?

Hi Team,

We are working on a form in Salesforce Marketing Cloud Next (MC Next) and need to implement input validation (e.g., blocking specific email domains like gmail.com) before form submission.

However, we are unable to find a way to add custom validation rules directly on the MC Next form. Validation rules on the Salesforce Lead Object are working, but they only trigger after submission, not at the form level.

Could you please confirm:

•  Does MC Next support native form-level validation? 
•  If not, what is the recommended approach for front-end validation? 
•  Are there any supported methods (JavaScript, AMPscript, etc.) to achieve this? 

Thanks in advance for your guidance.