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How are you checking to see if the email arrives?<br />
Please check using Outlook Web Access to see if the mail arrives and if it does, the problem will lie on the client with Outlook.<br />
If it does not arrive, please check your queues to see if mail is still stuck in the local delivery queue. &nbsp;if it is, please see who it is destined for and if it is for your user who is not receiving the email, please repair the store that this user is in, or if you have Exchange Enterprise, just move their mailbox to a different store.<br />
To repair Exchange - dismount the relevant store and run the following:<br />
eseutil /p<br />
eseutil /d<br />
isinteg -s servername -fix -test alltests (run twice or more until you see 0 errors and 0 fixes on the last line of output).<br />
For reference:<br />
<a href="http://www.msexchange.org/tutorials/Exchange-ISINTEG-ESEUTIL.html" rel="ugc">http://www.msexchange.org/tutorials/Exchange-ISINTEG-ESEUTIL.html</a>&nbsp;<br />

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How are you checking to see if the email arrives?
Please check using Outlook Web Access to see if the mail arrives and if it does, the problem will lie on the client with Outlook.
If it does not arrive, please check your queues to see if mail is still stuck in the local delivery queue.  if it is, please see who it is destined for and if it is for your user who is not receiving the email, please repair the store that this user is in, or if you have Exchange Enterprise, just move their mailbox to a different store.
To repair Exchange - dismount the relevant store and run the following:
eseutil /p
eseutil /d
isinteg -s servername -fix -test alltests (run twice or more until you see 0 errors and 0 fixes on the last line of output).
For reference:
http://www.msexchange.org/tutorials/Exchange-ISINTEG-ESEUTIL.html [http://www.msexchange.org/tutorials/Exchange-ISINTEG-ESEUTIL.html] 


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Which Exchange &nbsp;version you have? Did you try to view your message tracking logs? Do you have any antispam installed?
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Which Exchange  version you have? Did you try to view your message tracking logs? Do you have any antispam installed?

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One exchange user can send/receive email externally, but internal mail does not get delivered to internal users for this user. &nbsp;I just set up the Exchange server recently.
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One exchange user can send/receive email externally, but internal mail does not get delivered to internal users for this user.  I just set up the Exchange server recently.

Exchange User email Not Getting delivered to internal users

Hardware includes cell phones and other digital living devices, tablets, computers, servers, peripherals and components, printers and scanners, gaming consoles, networking hardware such as routers, hubs, switches and modems, storage devices and security equipment such as firewalls and other appliances.

Hardware

Microsoft server applications are those applications developed specifically, but not necessarily exclusively, on the Windows Server platform. In addition to well-known products like SQL Server, Exchange, Internet Information Services (IIS), Microsoft Dynamics, Forefront, Lync and Sharepoint, they include applications like Skype, BizTalk, Hyper-V, Groove and Commerce Server. Server applications are managed with the Microsoft System Center.

Microsoft Server Apps

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.