I have a custom domain and am using outlook as an email host for this. Whenever I send an email to someone else's address, they receive a 'Be careful! This sender failed our fraud detection checks' at the top of the email. My DNS records were set up using the information required by outlook when I linked the domain with outlook for email hosting. The DNS records include the line TXT v=spf1 include:hotmail.com ~all. Why are my emails still being detected as having 'failed' the fraud detection checks?

Thanks,

Ian.