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.
JotForm Support ManagerYour email address firstname.lastname@example.org is IN the bounce list.
I've already removed it. Please check this guide in order to know How to remove your email address from bounce list We had a similar problem in the past, on that occasion, yahoo blocked our mail servers for unknown reasons.
We will contact them if this is a trending problem.