It should be easy to send a confirmation to the submitter of a form. This should be a basic option. PLEASE.
You can’t do that today in Airtable natively, however you can configure a Zap in Zapier to accomplish this. If one of the fields is the email of the submitter, you can trigger an email from Zapier to the submitter using the “New record” trigger and “Send email” action!
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I just commented on a post from 2 years ago about this. Should be a basic feature without needing third party solutions.