Microsoft Exchange Online outage causes email delays, failures
ID: 78c15f01-1eca-5cc3-9a1b-b662fa01aa73
STIX ID: report--78c15f01-1eca-5cc3-9a1b-b662fa01aa73
Feed Name: Bleeping Computer
Threat Score
Microsoft is investigating a widespread Exchange Online service incident affecting mail flow in North America, Asia‑Pacific, and Europe. Users reported SMTP deferral errors and abrupt connection closures that have caused significant delays or failures in sending and receiving email; Microsoft has classified the outage as an incident and is analyzing mail queue backlogs and error reports to determine root cause and remediation steps.
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