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Having problems with HubSpot now? Check the current statusUpdates (3)
- May 2, 2026, 07:31 PMIntermittent DMARC failures for messages to Microsoft-hosted inboxes
HubSpot has continued to monitor the fix and believe we have addressed the underlying issue. Some messages deployed before May 1, 5 pm EDT may still experience delayed deliveries or failures over the next ~48 hours as retries and queues fully clear.
HubSpot ↗ - May 1, 2026, 04:34 PMIntermittent DMARC failures for messages to Microsoft-hosted inboxes
In April, some customers may have experienced intermittent DMARC failures on messages to Microsoft-hosted inboxes. Impact was most visible for senders with a DMARC policy of p=reject or p=quarantine. The root cause was related to how certain email headers were being handled. We have implemented a fix and will continue to monitor closely. While there may still be some residual impact to messages with elongated headers and as outstanding retries and queue delays clear over the next ~72 hours, we expect impact to remain limited.
HubSpot ↗ - May 1, 2026, 03:52 PMIntermittent DMARC failures for messages to Microsoft-hosted inboxes
In April, some customers may have experienced intermittent DMARC failures on messages to Microsoft-hosted inboxes. Impact was most visible for senders with a DMARC policy of p=reject or p=quarantine. The root cause was related to how certain email headers were being handled. We have implemented a fix and will continue to monitor closely. While there may still be some residual impact to messages as outstanding retries and queue delays clear over the next ~72 hours, we expect impact to remain limited.
HubSpot ↗
What to do next
- Verify your own services recovered cleanly. Some upstream outages leave queues or caches in a degraded state, run smoke tests before declaring green internally.
- Save the post-mortem. Vendors usually publish a detailed RCA 1-3 days later. We'll add it to this page when it appears.
- Watch the provider going forward. Follow HubSpot's status feed →
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