Get a dedicated support team with Jotform Enterprise.
Apply to Jotform Enterprise for a dedicated support team.
When I enable this option, the notification emails stop working altogether
When I test this on a cloned version of your form, it seems to be working properly.
When you enable the PDF Attachment option, please kindly make sure that the password meets the requirements:
If this does not help, please let us know if you are using our default sender, or a custom / SMTP sender.