What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
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.
I took a look at the email that you have contacted us over Erika and I see that the email is indeed in the bounce list.
This is the reason reported from your email server:
smtp; 550 Rejected by header based manually Blocked Senders: email@example.com - http://kb.mimecast.com/Mimecast_Knowledge_Base/Administration_Console/Monitoring/Mimecast_SMTP_Error_Codes#550
Based on the above, it seems that you have manually blocked firstname.lastname@example.org at some occasion, which is why it is rejecting our emails.
Please do check your account and make sure that email@example.com is whitelisted and you should be getting emails.
Do let us know how it goes.