Hi,
Quick question:
Do the customer need a Jira product licensens to be available to create tickets/issues when using the Mail Handler (mailing the external mailbox instead of directly to Jira)?
Background:
When we use the mail handler to pick up emails in a mailbox it doesn't create or update tickets/issues:

Error message:
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.]
It doesn't mater who send the email except if the user has a licens, then it picks up the email.
Troubleshooting:
- We have created the user as customer with their email adress - Doesn't help
- We have removed the user as customer and enabled "Create User" in the mail handler - Didn't help.
What we want:
- We want Jira Service Desk to pick up mail from our mailbox and create or update tickets/issues
- We want the mail handler to only pick-up mail from our Customer.
- We would like a notification if the mail handler didn't pick up a email.