Delivery Delays – Emails to Microsoft Hosted Domains And Others Held as “Processed”

Incident Report for SMTP2GO

Resolved

This incident has been resolved and mail queues have returned to normal.

Thank you for your patience.
Posted Sep 04, 2026 - 20:41 UTC

Monitoring

Excess server burden caused by knock on effects from the Microsoft service issue caused abnormal outbound queues.

A fix has been implemented and we are monitoring server queues
Posted Sep 04, 2026 - 14:38 UTC

Investigating

Our technical team is investigating an issue with some messages to various providers being shown as "Processed" and not reaching the recipient
Posted Sep 04, 2026 - 14:26 UTC

Update

We are investigating as this issue has now started affecting other providers, like Gmail
Posted Sep 04, 2026 - 14:04 UTC

Update

Microsoft has accepted responsibility for the current email delays. More details can be found on their status page and below:

Issue ID: EX1467029
Affected services: Exchange Online
Status: Service degradation
Issue type: Incident
Start time: Sep 4, 2026, 10:19 PM GMT+12

User impact
Users may experience a delay in sending and receiving email messages from external domains in Exchange Online.

More info
Users may experience intermittent “Server busy” errors, affecting multiple mailboxes.

Scope of impact
This issue impacts users who may be attempting to send and receive email messages from external domains in Exchange Online. This information may be updated as our investigation continues.
Posted Sep 04, 2026 - 12:04 UTC

Identified

While we continue to handle the ongoing issue with Microsoft domains, all indicators point to a larger, global issue with Microsoft itself. We will continue providing updates as they are available.

https://groups.io/email-provider-status?isp=Microsoft+365
Posted Sep 04, 2026 - 11:17 UTC

Investigating

Our team is currently investigating an issue causing some emails to remain in the “Processed” state to Microsoft email addresses, resulting in delivery delays and greylisting. We are working to resolve the issue.
We recommend safelisting wherever possible: https://support.smtp2go.com/hc/en-gb/articles/360000471954-Allowlisting-IP-Addresses-With-Microsoft-365
Posted Sep 04, 2026 - 08:58 UTC
This incident affected: Email sending (SMTP service).
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