Open Outlook 2013 and Click the File Menu. Next, select the Account Settings button and click Account Settings again.
Either double click the email account in the list or click once and select the 'Change' button.
This will bring up your email account's settings. In the 'Outgoing mail server (SMTP)' field, replace what is in there with the same as your incoming mail server. These both must match. change them to cloud.yourhostingproviderhostingserver.com
or whatever your hosting provide avails to you.
Select the 'Next' button in the email settings window to test and save changes. If you see a green tick next to 'Send test e-mail message' this means it is working successfully. Click close on the Test Account Settings window and then Finish. You are now ready to use your new SMTP Server to send emails in Outlook.
Original Source: http://bit.ly/2Gf9oM9