<div>
Try to find the issue with the Mail/Message Flow Troubleshooter<br />
under Exchange Management Console -&gt; Tools <br />
Run health check analyser as well<br />

</div>


Try to find the issue with the Mail/Message Flow Troubleshooter
under Exchange Management Console -> Tools
Run health check analyser as well


<div>
did you change your internal fqdn for exchange? is DNS testing clean on your network? (dcdiag /test:dns)
</div>


did you change your internal fqdn for exchange? is DNS testing clean on your network? (dcdiag /test:dns)

<div>
<div class="content wysiwyg-content">
Hello Guys,<br />
Suddenly we cannot send emails to internal users while we can receive from outside. We tried to restart all services in exchange 2010 but nothing work.<br />
<br />
please help
</div>
</div>


Hello Guys,
Suddenly we cannot send emails to internal users while we can receive from outside. We tried to restart all services in exchange 2010 but nothing work.

please help

Cannot send emails internally - Exchange 2010

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 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.

Outlook

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.