In this guide, you'll learn to how to quickly review your Exim mail queue if any from the WHM interface. This guide presuppose you are running a cPanel server with Exim as MTA. 

This menu allows you to troubleshoot mail deliveries issue and you may also force the delivery of all emails sitting in the queue or granularly deliver some emails. 

To proceed, you may simply login to the WHM Interface and click from the sidebar on Mail Queue Manager. 

You'll then access the Mail Queue Manager program. 

If it returns "no records found." it means that all your emails were actually delivered. 

That's it! From there, you'll be able to troubleshoot your email or initiate back a delivery after an event.