Todorovic Dragan

Exchange Online implementation for new customers also includes local Outlook settings in order to send/receive messages from desktop application. Few days ago, users have reported the following error: “530 5.7.1 Client was not authenticated” during account setup in Outlook 2010/2013.

This kind of issue is cause by incorrect SMTP authentication setting.

1. From the File menu, select “Info” and choose “Account Settings”
2. Select your account and click the “Change” button above.Click the “More Settings…” button in the bottom-right corner of the E-Mail Accounts window.
3. In the Internet Email Settings window, click the “Outgoing Server” tab.
4. Ensure that the box next to “My outgoing server (SMTP) requires authentication” is checked and “use same settings as my incoming mail server” is selected.