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I did not try to rebuild the OAB. I went through the Auto Recall on each local machine and deleted the Domain email addresses, and it started working after manually typing in their address or filling from contacts. The problem was caused from transferring the .NK2 file from the machines joined to the previous SBS2003 domain, and were indeed trying to resolve to the non existent Server. PS on SBS the Exchange Server and The DC are the same.
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I did not try to rebuild the OAB. I went through the Auto Recall on each local machine and deleted the Domain email addresses, and it started working after manually typing in their address or filling from contacts. The problem was caused from transferring the .NK2 file from the machines joined to the previous SBS2003 domain, and were indeed trying to resolve to the non existent Server. PS on SBS the Exchange Server and The DC are the same.

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I just set up new SBS 2011 Server, we can send and receive email outside the domain, but cant send and receive to internal domain users. &nbsp;Error #550 5.1.1 RESOLVER.ADR.ExRecipNotFou<wbr />nd; not found # # Please advise.
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I just set up new SBS 2011 Server, we can send and receive email outside the domain, but cant send and receive to internal domain users.  Error #550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found # # Please advise.

Can't send or receive internal email on new SBS 2011 domain

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.

Exchange

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

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).