Mail sent to Outlook ends up in Spam

Mail sent to Outlook ends up in Spam

Hi, 
All emails sent to outlook addresses end up in spam. I've played about with the dns records to no avail. I'm yet to receive a response so my support request which was sent 9 days ago. I've attached email headers to the email I sent to support to make it easier however it seems like they don't have a solution. After having a look on here and seeing how common this issue is, i'm surprised there isn't a dedicated page for a fix. This issue is affecting business and if it can't be resolved, i'll have no choice but to go elsewhere.

Thanks