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When I run the mail flow trouble shooter i get this message:<br />
Mail submission failed: Error message: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated.<br />
Only new users added to the e-mail server are not getting external e-mail
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When I run the mail flow trouble shooter i get this message:
Mail submission failed: Error message: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated.
Only new users added to the e-mail server are not getting external e-mail

New Users not getting e-mail from outside

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.