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.
According to my checks, the related email address "firstname.lastname@example.org" has been receiving email submissions without any issue. Please, see its mail log from the below:
At that point, you need to be sure that your mail provider is not blocking our messages. To do that operation, you need to communicate with your server administrator. Ask them to whitelist our addresses. Please whitelist following addresses:
Alternatively, you can use the SMTP method to send your emails with using your server, so you can beat that problem completely.
To do that, please follow the instructions from How to Setup SMTP for a form page.
Also, please don't forget to check your Spam, Junk or Promotions folders on your mailbox. If the problem consist, please let us know.