Delayed or failed email delivery to Microsoft sender addresses
Last updateresolvedSep 4 · 21:06 UTC
Resolved. The backlog is fully delivered: every email held up during the incident has now been sent, and delivery to Microsoft business mailboxes has been back to normal since Microsoft closed its incident. What happened: from around 11:30 CEST, a global Microsoft incident on inbound mail stopped our notifications from reaching business mailboxes hosted by Microsoft 365 and Exchange Online. Personal addresses such as outlook.com, hotmail.com and live.com were never affected, and no other email provider was involved. Our systems kept sending normally throughout, and the messages were queued by our provider rather than lost. Once Microsoft restored service, that queue was flushed over the following hours, which is why some notifications arrived late this afternoon and this evening. The cause and the fix were both on Microsoft's side. What we can improve is how quickly we detect a blockage at a single provider and tell you about it, and we are working on that. Thank you for your patience, and sorry for the disruption this caused to your day.
Reported by Yousign on their status page.
