Microsoft Outlook Warning: "A program is trying to send an e-mail message on your behalf"

If you are trying to send an email from Chintaro and you are getting warning messages, they will not prevent you from sending the email out, but will pop up each time you try and send one with the following warnings:

To fix this and ensure these messages don't appear, please refer the following Microsoft solution to your IT department or systems administrator: https://support.microsoft.com/en-au/help/3189806/a-program-is-trying-to-send-an-e-mail-message-on-your-behalf-warning-i