What happened
Microsoft 365 (Outlook 365) experienced a widespread service outage on Thursday, January 22, 2026, beginning around 1:40 PM MT. Microsoft reported service restoration around 11:30 PM MT that evening.
During the outage, Microsoft 365 rejected inbound email traffic. As a result, emails sent from Mazévo to recipients using Microsoft 365 were not delivered, regardless of which email system the sender’s organization uses. Because those messages were rejected, Mazévo temporarily flagged affected recipients as undeliverable to prevent repeated failed sends.
Although Microsoft restored service late Thursday evening, emails to those recipients remained paused until Mazévo cleared the backlog and removed the temporary delivery blocks at approximately 3:00 PM MT on Friday.
What this means for Mazévo customers
If your organization sent emails from Mazévo to recipients who use Microsoft 365, those emails were not delivered during the outage window. This includes confirmations, invoices, approval notifications, reminders, and scheduled reports.
This applies even if your organization uses Google Workspace (Gmail) or another email provider. The determining factor was the recipient’s use of Microsoft 365, not the sender’s email system.
If neither you nor your recipients use Microsoft 365, your email delivery was not affected.
No event data, approvals, invoices, or reports were lost. Only email delivery was impacted.
What this means for you
If you sent emails from Mazévo between approximately 2:00 PM MT on Thursday and 3:00 PM MT on Friday to recipients using Microsoft 365, we recommend verifying with those recipients that they received the messages.
If needed, please manually resend:
- Confirmations
- Invoices
Note that Approval notifications, Automated reminders, scheduled emails or scheduled reports may have also been affected.
Mazévo does not automatically resend emails that were blocked during the outage.
What you need to do now
Email delivery has been fully restored and is operating normally.
Please review any important communications sent Thursday afternoon or Friday and resend them if confirmation of receipt is required, especially if those messages were sent to recipients using Microsoft 365.
What we are doing going forward
We are evaluating enhancements to our email monitoring and notification processes so we can detect and respond to third-party email service disruptions earlier.
We appreciate your patience and understanding while Microsoft worked to resolve this outage.
For real-time system updates, please visit our status page at https://status.gomazevo.com/. You can also subscribe there to receive notifications when incidents are posted or resolved.
If you have any questions or need assistance, please contact Mazévo Support at support@gomazevo.com.
