Forum Discussion
550 5.7.705 Tenant Email Block 55+ Hours - Support Unresolved
Our M365 tenant (labaradorpake.onmicrosoft.com) has been blocked from sending outbound email for over 55 hours with error 550 5.7.705 Access denied, tenant has exceeded threshold. Despite multiple su...
Hi, 550 5.7.705 usually means Microsoft has blocked outbound mail for the tenant due to suspected abuse or policy triggers. I’d check Defender/Exchange admin center alerts, remove any compromised accounts or risky forwarding rules, reset affected passwords, and then submit an unblock request from the admin portal. Support will usually want evidence that the root cause has been cleaned up.