Is Heysender down?
Last checked 1m agoNo incidents right now.
Heysender is operational right now. Last checked 1m ago; the most recent incident resolved 57d ago.
Real-time Heysender status, recent outages, and incident history: pulled directly from Heysender's official status page at status.heysender.com every 5 minutes. Pingoru tracks 4 Heysender services and has captured 6 incidents in the last 90 days (98.89% uptime). Get email, Slack, Discord, or webhook alerts the moment Heysender reports a new incident, free for 3 monitors, no credit card.
Recent outages & incidents
Past 90 days- Outgoing SMTP
Timeline · 2 updates
- monitoring · Sep 04, 2026, 12:00 PM UTC
Since 9:50 CEST this morning Microsoft has had issues receiving email. This means that many emails sent to Office365 recipients will result in a soft bounce with this message: 52.101.68.10 failed after I sent the message./Remote host said: 451 4.7.500 Server busy. Please try again later from \[REDACTED\]. (S77714) \[[DB1PEPF000509E3.eurprd03.prod.outlook.com](http://DB1PEPF000509E3.eurprd03.prod.outlook.com) 2026-09-04T08:16:36.825Z 08DF04AEA47F75BA\]/ If you have access to the Office365 admin page they have created an issue to follow here: We're monitoring the issue but for now there is nothing we can do to force emails through. Emails sent during Microsoft downtime will be tried again for the following 48 hours until delivery is possible. (We're mainly creating this issue to have a place to point clients to for updates. There is nothing we can do inhouse to solve the issue.)
- resolved · Sep 04, 2026, 01:20 PM UTC
This incident has been resolved by Microsoft. We're working on emptying the queues and we expect all email to be delivered soon.
Latest: This incident has been resolved by Microsoft. We're working on emptying the queues and we expect all email to be delivered soon.
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Timeline · 2 updates
- monitoring · Sep 04, 2026, 12:00 PM UTC
Since 9:50 CEST this morning Microsoft has had issues receiving email. This means that many emails sent to Office365 recipients will result in a soft bounce with this message: 52.101.68.10 failed after I sent the message./Remote host said: 451 4.7.500 Server busy. Please try again later from \[REDACTED\]. (S77714) \[[DB1PEPF000509E3.eurprd03.prod.outlook.com](http://DB1PEPF000509E3.eurprd03.prod.outlook.com) 2026-09-04T08:16:36.825Z 08DF04AEA47F75BA\]/ If you have access to the Office365 admin page they have created an issue to follow here: We're monitoring the issue but for now there is nothing we can do to force emails through. Emails sent during Microsoft downtime will be tried again for the following 48 hours until delivery is possible. (We're mainly creating this issue to have a place to point clients to for updates. There is nothing we can do inhouse to solve the issue.).
- resolved · Sep 04, 2026, 01:20 PM UTC
This incident has been resolved by Microsoft. We're working on emptying the queues and we expect all email to be delivered soon..
Latest: This incident has been resolved by Microsoft. We're working on emptying the queues and we expect all email to be delivered soon..
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Timeline · 2 updates
- investigating · Aug 10, 2026, 10:13 AM UTC
We're currently experiencing issues sending e-mails from our system. We're investigating the cause..
- resolved · Aug 10, 2026, 02:55 PM UTC
Due to an issue with our hosting provider Heysender could not send email for a few hours this afternoon. The issue has been solved and we're monitoring the state of the service for the rest of the day..
Latest: Due to an issue with our hosting provider Heysender could not send email for a few hours this afternoon. The issue has been solved and we're monitoring the state of the service for…
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- APIOutgoing SMTP
Timeline · 2 updates
- investigating · Aug 10, 2026, 10:13 AM UTC
We're currently experiencing issues sending e-mails from our system. We're investigating the cause.
- resolved · Aug 10, 2026, 02:55 PM UTC
Due to an issue with our hosting provider Heysender could not send email for a few hours this afternoon. The issue has been solved and we're monitoring the state of the service for the rest of the day.
Latest: Due to an issue with our hosting provider Heysender could not send email for a few hours this afternoon. The issue has been solved and we're monitoring the state of the service for…
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Incident record
Since April 2026 · Instatus · 4 components checked every 5 minutesThe longest incident in the last year, Issues with events on April 16, 2026, ran for 116 days. 2 maintenance windows announced in the same period.
Most affected components, last 12 months
- Overall3
- Outgoing SMTP2
- API1
- App1
Latest incidents
- Microsoft has issues receiving email
Since 9:50 CEST this morning Microsoft has had issues receiving email. This means that many emails sent to Office365 recipients will result in a soft bounce…
- Microsoft has issues receiving email
Since 9:50 CEST this morning Microsoft has had issues receiving email. This means that many emails sent to Office365 recipients will result in a soft bounce…
- Issues with sending.
We're currently experiencing issues sending e-mails from our system. We're investigating the cause..
- Microsoft has issues receiving email ResolvedStarted Sep 04, 2026, 12:00 PM UTC · Resolved Sep 04, 2026, 01:20 PM UTC · 1h 19m
- Microsoft has issues receiving email ResolvedStarted Sep 04, 2026, 12:00 PM UTC · Resolved Sep 04, 2026, 01:20 PM UTC · 1h 19m
- Issues with sending. ResolvedStarted Aug 10, 2026, 10:13 AM UTC · Resolved Aug 10, 2026, 02:55 PM UTC · 4h 42m
- Issues with sending. ResolvedStarted Aug 10, 2026, 10:13 AM UTC · Resolved Aug 10, 2026, 02:55 PM UTC · 4h 42m