JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Are you referring to email notifications? If so, our developers have worked on a recent issue regarding email notifications and custom sender address and it was already resolved.
I checked your form, http://form.jotformpro.com/form/51092428762962, and noticed that you are using a custom sender e-mail. If the issue still continues on your end, please change the Email address in Sender field to email@example.com or firstname.lastname@example.org. Or use the other method: How to use Mandrill to Send Emails From Your Own Email Address.
Do let us know if you need further assistance.