- Level
- confirmed
- Worst impact
- Degraded
- Components
- Email sending (SMTP service)
- Down Index
- 27of 100
What to do
Check whether you use SMTP2GO Email sending (SMTP service). Check your stack
Paste a package.json, lockfile, Terraform or a list of domains at down.guide/stack to see every provider you depend on.Confirm your retries, queues and scheduled jobs caught up after the 11h 43m it lasted.
Anything that failed between 2026-09-04 08:58 UTC and 2026-09-04 20:41 UTC may need a replay.Subscribe to SMTP2GO's feed to hear about the next one first. RSS feed
https://down.guide/feed?provider=smtp2go works in Slack (/feed subscribe), Discord feed bots and any RSS reader.
Updates from SMTP2GO 7
- 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
provider
- 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
provider
- identified
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.
provider
- identified
We are investigating as this issue has now started affecting other providers, like Gmail
provider
- investigating
Our technical team is investigating an issue with some messages to various providers being shown as "Processed" and not reaching the recipient
provider
- 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
provider
- resolved
This incident has been resolved and mail queues have returned to normal. Thank you for your patience.
provider
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Corrections
None so far.
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Questions about DWN-399e7f8d55
Is SMTP2GO still down?
No, this incident was resolved 2026-09-04 20:41 UTC. For SMTP2GO's live state, see https://down.guide/smtp2go.
How long did it last?
11h 43m, from 2026-09-04 08:58 UTC to 2026-09-04 20:41 UTC, by the times SMTP2GO posted.
What was affected?
SMTP2GO named Email sending (SMTP service).
What caused it?
SMTP2GO hasn't published a root cause. If it does, it shows here.
Where does this come from?
SMTP2GO's official status page, https://smtp2gostatus.com, quoted verbatim. down.guide's own probes, reports and social counts are labeled as ours.