Zendesk troubleshooting: suspended email, threading, notifications and trigger conditions
For Zendesk admins and lead agents: what suspended and rejected email are, reading the cause of suspension and recovering or deleting safely, mail loops caused by forwarding from a support address, why an email threads into the wrong ticket, why a customer's reply didn't reopen a ticket, why CCs or customers get no email (or several), and how Created/Updated and 'meet all'/'meet any' trigger conditions decide when a trigger fires. Each topic follows Zendesk's own troubleshooting articles: what to check first, the usual cause and the fix.
- Level
- Intermediate
- Length
- About 50 minutes
- Contents
- 3 lessons · 1 video · final exam
- Status
- Published · updated 2 Oct 2026
- Zendesk
Skills you'll practise
- Tell suspended from rejected email and review the Suspended tickets view before items are deleted
- Choose between recovering, recovering manually and deleting based on the cause of suspension
- Find why an email threaded into an existing ticket from its original source
- Use ticket events to diagnose replies that don't reopen tickets, missing CC emails and duplicate notifications
- Predict when a trigger fires from its Created/Updated and 'meet all'/'meet any' conditions
Course outline
- 1.Troubleshooting Zendesk emailVideo · 2 min
- 2.Suspended and rejected emailLesson · 17 min
- 3.Mail loops and threadingLesson · 16 min
- 4.Notifications, reopening and trigger conditionsLesson · 17 min
- 5.Zendesk troubleshooting: suspended email, threading, notifications and trigger conditions: knowledge checkKnowledge check · 15 questions
- 6.Final exam7 questions · passing it completes the course, so people who already know the material can test out
Sources it draws on
The lessons and questions are written from these references, so learners can go back to the original.
- Zendesk help: Understanding suspended tickets and spam
- Zendesk help: Viewing, recovering, and deleting suspended tickets
- Zendesk help: Guidelines for reviewing suspended tickets
- Zendesk help: How do I avoid emails becoming suspended tickets?
- Zendesk help: What does the cause of suspension message 'Received from support address' mean?
- Zendesk help: Why do emails thread to the wrong ticket?
- Zendesk help: Why is the customer's reply not changing the ticket status to open?
- Zendesk help: Why are CCed users not receiving emails?
- Zendesk help: Why do my customers receive multiple emails for every ticket update?
- Zendesk help: How can I tell if Zendesk is sending email notifications to customers?
- Zendesk help: What is the difference between Created and Updated?
- Zendesk help: What is the difference between 'meet all' and 'meet any' conditions?
See it with your own jobs and topics
Tell us about your team and we'll walk you through setup, from choosing jobs to your first skills check.