Outlook 2010 and newer:
- From the Menu Bar, Click the "File" tab.
- Click the Info tab on the left and select "Accounts Settings">> Click "Account Settings".
- Select your Email account then Click "Change".
- Click "More settings".
- Select "Outgoing Server" tab.
- Select the box beside "My outgoing server (SMTP) requires authentication".
- Select "Use same settings as my incoming email server".
- Save and finish.
Microsoft Outlook 2007 and earlier:
- From the Menu Bar, Click "Tools" then Click "E-mail Accounts".
- Select "View or change existing e-mail accounts" then Click "Next".
- Select your Email account then Click "Change"
- Click "More settings".
- Select "Outgoing Server" tab.
- Select the box beside "My outgoing server (SMTP) requires authentication".
- Select "Use same settings as my incoming email server".
- Save and finish
MacMail:
- In Mac Mail Click Mail >> Preferences >> Accounts
- Near bottom of the window, find "Outgoing Mail Server (SMTP)", click the drop down arrow and select "Edit SMTP Server List..."
- Click the "Advanced" button in the center of the window and make sure Authentication is set to "Password".
- Click "Ok" and finish
- From Menu Bar, click "Tools", then "Account Settings".
- Click on "Outgoing Server (SMTP)" at the bottom of the list in on the left side of the window.
- Back in the middle of the window, select the appropriate outgoing server and click the "Edit" button.
- Make sure "Authentication method" is set to "Normal password".
- Click "OK" and finish