topic Microsoft Exchange Online hit by new outage blocking emails in Threats https://community.isc2.org/t5/Threats/Microsoft-Exchange-Online-hit-by-new-outage-blocking-emails/m-p/60942#M852 <P>Hi All</P><P>&nbsp;</P><P>Interesting more Microsoft fun, Exchange Online outages blocking emails affecting USA, UK and other regions.</P><P>&nbsp;</P><P><A href="https://www.bleepingcomputer.com/news/microsoft/microsoft-exchange-online-hit-by-new-outage-blocking-emails/" target="_blank">https://www.bleepingcomputer.com/news/microsoft/microsoft-exchange-online-hit-by-new-outage-blocking-emails/</A></P><P>&nbsp;</P><P>Microsoft is investigating an ongoing Exchange Online outage preventing customers from sending emails and triggering 503 errors on affected systems.</P><P>Impacted users report having issues with emails sent from Microsoft 365 environments being returned with "503 5.5.1 Bad sequence of commands" errors.</P><P>&nbsp;</P><P>Regards</P><P>&nbsp;</P><P>Caute_Cautim</P> Mon, 09 Oct 2023 10:38:36 GMT Caute_cautim 2023-10-09T10:38:36Z Microsoft Exchange Online hit by new outage blocking emails https://community.isc2.org/t5/Threats/Microsoft-Exchange-Online-hit-by-new-outage-blocking-emails/m-p/60942#M852 <P>Hi All</P><P>&nbsp;</P><P>Interesting more Microsoft fun, Exchange Online outages blocking emails affecting USA, UK and other regions.</P><P>&nbsp;</P><P><A href="https://www.bleepingcomputer.com/news/microsoft/microsoft-exchange-online-hit-by-new-outage-blocking-emails/" target="_blank">https://www.bleepingcomputer.com/news/microsoft/microsoft-exchange-online-hit-by-new-outage-blocking-emails/</A></P><P>&nbsp;</P><P>Microsoft is investigating an ongoing Exchange Online outage preventing customers from sending emails and triggering 503 errors on affected systems.</P><P>Impacted users report having issues with emails sent from Microsoft 365 environments being returned with "503 5.5.1 Bad sequence of commands" errors.</P><P>&nbsp;</P><P>Regards</P><P>&nbsp;</P><P>Caute_Cautim</P> Mon, 09 Oct 2023 10:38:36 GMT https://community.isc2.org/t5/Threats/Microsoft-Exchange-Online-hit-by-new-outage-blocking-emails/m-p/60942#M852 Caute_cautim 2023-10-09T10:38:36Z