Step 1
With Microsoft Outlook 2013 running, click “File.”
Step 2
Click the account settings drop down, and then click Account Settings
Step 3
With your email account selected, please click “Change.”
Step 4
Please click “More Settings,” in the lower left right hand corner.
Step 5
From the “Outgoing Server” tab, please uncheck “My outgoing server (SMTP) requires authentication.”