Delay in Internal Email Delivery

I have a few users that when sending internal emails the recipient is receiving the email many hours later.  I have verified this through message tracking that the recipient is receiving the email many hours later.  I checked the users sent items folder and it shows the email being sent earlier then the recipient received.  Could it possibly be something on the client side?  Running Exchange Enterprise 2003, SP2 - Outlook 2003.
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MrMintanetConnect With a Mentor Commented:

What do you get for your MX lookup?
Steven WellsSystems AdministratorCommented:
Internal email delays could be caused by high disk queue lengths on your exchange server, but for 2 hours that would most likely point to their outlook client. If the sender is using cache mode, perhaps they were off line when they sent it?
HudsonHealthAuthor Commented:
Turned out blacklisted for some reason.  Corrected.  Thank you.
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