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I am currently migrating from 2007 to 2013. &nbsp;I am moving mailboxes and have both servers coexisting. &nbsp;I moved my mailbox last night and when I woke up my phone automatically changed to the new server address and was receiving mail no problem. &nbsp;My issue is I cannot send. &nbsp;I receive an undeliverable. &nbsp;If I am connected internally via outlook I can send and receive inside and out no issues.<br />
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What am I missing?
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I am currently migrating from 2007 to 2013.  I am moving mailboxes and have both servers coexisting.  I moved my mailbox last night and when I woke up my phone automatically changed to the new server address and was receiving mail no problem.  My issue is I cannot send.  I receive an undeliverable.  If I am connected internally via outlook I can send and receive inside and out no issues.

What am I missing?

Exchange 2007 to 2013 Mobile Phone Issues

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

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.