Since some days, email sent from customer (only one as far I know) did not create support ticket automatically.
SMTP communication has been tested, messages sent from customer to others are arriving without problems. There are no changes made on the customer side, related to email communication.
How and where should I test first for potential failure?
Is there any debugging available to test email communication?
P.S. I'am not an Service Desk administrator, simple user only.