Changing the Outlook 2013 Outgoing mail Port
1. Select the 'File' menu and click the 'Account Settings' dropdown then 'Account Settings' button.
2. Select the account with Enlighten Hosting and then select 'Change'
3. Select 'More settings'
4. Select the 'Advanced' tab
5. Change the Outgoing Server (SMTP) port from 25 to 366
6. Select 'OK' then 'Next', 'Close' and then 'Finish' and you're done.