Internal email delivery very slow

We are using Exchange 2013 for our email server and Outlook 2013 for the clients.  There are less than 100 mailboxes on the server.  When sending an email it is taking over 10 minutes for message to be delivered both internally and externally.  This has never been an issue in the past.  There have been no changes to the mail server.  Any ideas what could be causing this?
NytroZAsked:
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Simon Butler (Sembee)ConsultantCommented:
You need to be sure whether this is a delivery problem or a display problem.
In my experience, when this kind of thing is reported it isn't a problem with the actual mail delivery - when viewing the message tracking logs it shows the messages are delivered to the mailbox in the correct time. Instead it is an issue with the Outlook client not updating on its own very frequently.

OWA should be real time, if the messages are seen immediately through there, then it is a client issue.
If external email, you need to look at the headers to see where the delay was.

Simon.
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NytroZAuthor Commented:
I don't' think the problem is with the client.  I notice the same behavior whether it is Outlook or OWA.  When I send a message it does not get received in the Exchange server queue until much later.  for example, I sent a message this morning and used the time as the subject at 8:57.  I then viewed the servers queue and did not see the message in the queue until 14 minutes later.  It has now been in the queue for 10 minutes and still has not been delivered.
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Simon Butler (Sembee)ConsultantCommented:
What does message tracking say?
Is the server fully patched? Anything in the event logs about transport issues?

Simon.
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NytroZAuthor Commented:
message tracking pointed me in the right direction.  It turns out the DNS server setting on the NIC card had a bad IP address.  After removing that address all is well.
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