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When you use the paypal option within your form, after the user completed the filling process and hits submit it will be redirected to the paypal login in order to proceed with the payment, once the payment process is successfully completed by paypal the user will be redirected to the thank you page and will receive the mail autoresponder.
I hope I have clarified your doubts,
please let us know if you need further assistance
If you're asking about whether it's possible for users to receive an auto-response even if they have not completed their payment, please see our colleague Jonathan's reply in this thread.
Thank you Victor and Abajan - both your responses are very helpful. I will follow Jonathan's thread so users can receive an auto-response whether they complete payment or not.
On behalf of everyone, you are welcome. We are glad to help. If you have any more questions or issues, please do not hesitate contacting us.
Have a great day.