- Level
- confirmed
- Worst impact
- Degraded
- Down Index
- 16of 100
What to do
Check whether your product depends on Mailjet. 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 32m it lasted.
Anything that failed between 2026-09-04 12:23 UTC and 2026-09-04 12:55 UTC may need a replay.Subscribe to Mailjet's feed to hear about the next one first. RSS feed
https://down.guide/feed?provider=mailjet works in Slack (/feed subscribe), Discord feed bots and any RSS reader.
Updates from Mailjet 2
- monitoring
Starting around 08:00 UTC, Microsoft began experiencing an incident causing an increased volume of deferred emails across all M365 regions. The affected responses are returning "451 4.7.500 Server busy". Our teams are actively monitoring the situation. Sending to other email providers is not affected.
provider
- resolved
This incident has been resolved.
provider
Reports count in aggregate; nothing about you is shown.
Corrections
None so far.
Something wrong on this page? Report an error or send us a note. Every fix is listed here.
Questions about DWN-e6dbd79a86
Is Mailjet still down?
No, this incident was resolved 2026-09-04 12:55 UTC. For Mailjet's live state, see https://down.guide/mailjet.
How long did it last?
32m, from 2026-09-04 12:23 UTC to 2026-09-04 12:55 UTC, by the times Mailjet posted.
What caused it?
Mailjet hasn't published a root cause. If it does, it shows here.
Where does this come from?
Mailjet's official status page, https://status.mailjet.com, quoted verbatim. down.guide's own probes, reports and social counts are labeled as ours.