Forum Discussion
Tenant blocked from sending email
Last Monday, our entire Office 365 domain was blocked from sending email. The reason was because "The majority of traffic from this tenant has been detected as suspicious and the tenant has been rest...
Same with my tenant, required MFA for all 365 services. Received alert with 40k outbound spam in 24hrs while message trace showed 11k email inbound and outbound total in 2 days. Can not find out where the remaining came from. MS support keep saying working with backend team but no report or detail about spam flow. Don't know what happen here.