Whenever a customer tries to create an issue via email, I get the following message in my logs.
Cannot create issue due to invalid license: [Sorry, you can't create any issues right now, as you need to have access to a JIRA application to be able to create issues. To gain application access you need to be a member of a group assigned to an application.]
The users have project permissions and create issues via the portal just not via email.
JIRA also claims that comments have been added to existing issues when a customer responds via email but they don't show on the tickets page.
Bill.