Numerous External Email Messages are Pending

We are running Exchange 2013.  Some of my users are telling me that they are sending messages but the recipients are not receiving them.  I have check the delivery reports for some of these email messages that are not being received and they are all show the following:


Submitted
2/26/2018 1:17 PM SVR-EXCHANGE-01
The message was submitted to svr-exchange-01.ad.mydomain.com.

Pending
2/26/2018 3:59 PM SVR-EXCHANGE-01
Message delivery is taking longer than expected. There may be system delays. For more information, contact your helpdesk.

When I go into the Exchange Queue Viewer, there are no messages in the queue.

This is happening to a lot of email being sent externally.  Any ideas?
csimmons1324IT ManagerAsked:
Who is Participating?
 
Todd NelsonSystems EngineerCommented:
Could be a back pressure issue related to not enough available disk space or assigned memory.

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Gaurav SinghSolution ArchitectCommented:
check for any backups are not runnings and check the disk space on the server as well IOP of disk .
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csimmons1324IT ManagerAuthor Commented:
Todd,

How can I check to see if it is a back pressure related issue?
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Todd NelsonSystems EngineerCommented:
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Todd NelsonSystems EngineerCommented:
Sufficient information provided for solution.
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