JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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If I understood you correctly, you are referring to the notification emails that are being sent to you when submissions are being made on your form. Yes, you can use a custom Sender Email instead of our firstname.lastname@example.org options, by following this guide:
You will be able to send notifications with your custom sender email address.
Similarly to the above, you can even send notifications through your own SMTP server:
Both of the above methods will ensure that the recipient sees your address as the sender, and not JotForm.
Please let us know if you need any further clarifications or assistance, and we will be happy to help.