Hi There!

Are you talking about the form builder or the contact form addon?

Which template is it?

For the contact form addon:

https://www.joomshaper.com/documentation/sp-page-builder/sp-page-builder-3/addons#contact-form

Remember to fill those two fields from settings: "From Name" and "From Emai"l (use email from your domain, but different that used in "Recipient Email" field, and check again.

If won't help - please check mail spam folder.

For the form builder addon:

Please check the following documentation and tutorial...

https://www.joomshaper.com/documentation/sp-page-builder/sp-page-builder-3/addons#form-builder

https://www.youtube.com/watch?v=XQ3ZITh9JCk

Hope these helps!

Best Regards