EX522020 - Users may be unable to access their Exchange Online mailbox or send/receive messages
EX522020 - Users may be unable to access their Exchange Online mailbox or send/receive messages
March 01, 5:58pm GMT
March 01, 5:58pm GMT
Microsoft Reference Number: EX522020
User impact: Users may be unable to access their Exchange Online mailboxes or send and receive email messages. More info: Users may receive an error message including: “550 5.4.1 Recipient address rejected: Access denied” when attempting to send or receive messages. Current status: We’ve identified a potential Directory Based Edge Blocking (DBEB) issue that may be contributing to impact. We’re investigating this alongside our existing diagnostic data to determine our next steps. Scope of impact: Impact is specific to users who are served through the affected infrastructure in North America, Europe, and the United Kingdom.
March 02, 9:35am GMT
March 02, 9:35am GMT
Good Morning,
Microsoft have confirmed that the issue is now resolved.
Preliminary root cause: A portion of Exchange Online Protection (EOP) infrastructure wasn’t operating as expected due to a potential misconfiguration, resulting in the impact.
If you continue to have issues sending/receiving mail, please reach out to the Technical Support Team to investigate further.
