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HubSpot

Intermittent DMARC failures for messages to Microsoft-hosted inboxes

Degraded Lasted 1d 3h · started · HubSpot's page

Level
confirmed
Worst impact
Degraded
Down Index
23of 100

What to do

  • Check whether your product depends on HubSpot. 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 1d 3h it lasted.

    Anything that failed between 2026-05-01 15:52 UTC and 2026-05-02 19:31 UTC may need a replay.
  • Subscribe to HubSpot's feed to hear about the next one first. RSS feed

    https://down.guide/feed?provider=hubspot works in Slack (/feed subscribe), Discord feed bots and any RSS reader.

Updates from HubSpot 3

  1. monitoring

    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.

    provider

  2. monitoring

    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.

    provider

  3. resolved

    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.

    provider

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Corrections

None so far.

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Questions about DWN-8bdddad838

Is HubSpot still down?

No, this incident was resolved 2026-05-02 19:31 UTC. For HubSpot's live state, see https://down.guide/hubspot.

How long did it last?

1d 3h, from 2026-05-01 15:52 UTC to 2026-05-02 19:31 UTC, by the times HubSpot posted.

What caused it?

HubSpot hasn't published a root cause. If it does, it shows here.

Where does this come from?

HubSpot's official status page, https://status.hubspot.com, quoted verbatim. down.guide's own probes, reports and social counts are labeled as ours.