GoDaddy and Office 365

My domain and DNS is managed by GoDaddy but I utilize Office 365 for all of my mail. That is where we work and send/receive our email.

When I look at my sources it shows 98% of my email coming from GoDaddy and only 2% coming from Office 365. Can anyone explain why all of that mail isn’t coming from Office 365 as a source? Is it because the DNS is managed by GoDaddy and the MX record is there (even though it points to Microsoft)?