30-04-2021 11:35:17 AM (BST)
Issue Reported: 29/04/2021 9:16:00 AM
Microsoft Reference : EX253410
Issue Status: RESOLVED
Issue Description: We are aware of an issue wherein users may experience delays of over an hour when sending email messages via any Exchange Online connection method.
Scope of impact: This issue may affect any user attempting to send email via Exchange Online.
Current Update – 30/04/2021 11:35:00 AM: Microsoft have determined that a recent update which contained listings and de-listings weren’t properly deploying due to a corrupted rule which had recently saturated to the affected environment. Microsoft have fixed the corrupted rules and have successfully deployed the new build, which has remediated impact. Service has been restored to normal.