How do you block and/or exclude competitors and non-work (i.e. yahoo.com) emails from being able to submit a form successfully?
But without JS, you can black list them, which will prevent them from receiving any auto-response and any email.
You are welcome
To prevent them from submitting the form you will need some page side scripting to perform form validation.
To let them submit and prevent them from receiving any response, create a smart campaign that adds anyone with email addresses which contain the offending domain names to the blacklist
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