Hi Slevy,
Thank you for your post.
Did this issue occur if your users using
Outlook client or Outlook Web App to receive and read emails?
You can check the transport rules for
emails by referring to the link below:
Actions for Transport
Rules
Regarding to your request about contact
Microsoft for support, the Service Request and Phone Call for technical issue
are supported for Office 365 for Enterprise users currently.
1.To submit a Service Request, please refer Contact
Support for a technical issue
2.To find a phone number for your country
or region, sign in to Office 365. On the Admin Overview page, on the
left pane, under Support, click Overview.
If you are an user of Office 365 for
Professional and Small Business, you can get support in this community forum
for this issue.
Thanks,
Jolin Qiao