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Status Updates | ZeroBounce Outage History

Daily provider-status observations and published incident history for Status Updates | ZeroBounce.

Operational

Status Updates | ZeroBounce is operational. Verified . Official provider source.

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96.4% of 83 verified observed days had no reported provider issue

90-Day Trend

Aug 18Nov 15

Dashed calendar markers below identify legacy observations whose source-at-observation was not recorded.

Monthly Status Summary

Month Issue-free days Days Tracked Days with issues
October 2026 96.8% 31 1
September 2026 100% 30 0

This percentage summarizes normalized provider-status observations by calendar day. It is not duration-based, component-weighted, or contractual uptime. See the methodology and limitations.

Recorded Daily Status (Last 91 Days)

Aug 17 Today
Legacy observation Operational Degraded Partial Outage Major Outage Maintenance No Data

Incident History

November 2026
Delayed results for Microsoft-hosted email addresses
minor Observed active window 20h 12m

View incident details and source

Started:

API API-US API-EU Bulk API
monitoring
Microsoft reports broad recovery across its email services, and we’re seeing errors for Microsoft-hosted addresses drop significantly. Validation is returning to normal processing times. Because Microsoft is still clearing a backlog of delayed messages (held for up to 48 hours), warmup activity and Inbox Placement Tester results involving Outlook, Hotmail, Live, MSN and Microsoft 365 inboxes may continue to show late or incomplete deliveries for a while. For accurate Microsoft placement data, we recommend re-running tests once this incident is marked resolved. All other email providers remain unaffected. We’ll post a final update once Microsoft confirms full resolution.
identified
We’re tracking Microsoft’s progress and will post an update as soon as we see recovery.
identified
We’re aware of an ongoing Microsoft service disruption affecting their mail infrastructure. Validation requests for Microsoft-hosted addresses (e.g. Outlook, Hotmail, Live, MSN and Microsoft 365 business domains) may take longer than usual to process, and some may temporarily return as “unknown.” All other email providers are unaffected, and our platform is fully operational. Validation, scoring and API services for non-Microsoft addresses continue to run normally. Warmup activity involving Microsoft inboxes may also see delays until the disruption is resolved. Inbox Placement Tester: Results for Microsoft seed inboxes (Outlook, Hotmail, Microsoft 365) may be delayed or temporarily incomplete. Placement results for Gmail, Yahoo and other providers are not affected. If you need full Microsoft results, we recommend re-running the test once the disruption is resolved. No action is needed on your end. We’re monitoring Microsoft’s status and will post an update once their service is restored. For time-sensitive lists, we recommend re-validating any “unknown” Microsoft results after the incident is resolved.
October 2026
File uploads issues
minor Observed active window 19m

View incident details and source

Started:

Website Members Section
identified
We have identified the issue and we are working on stabilizing the upload files backend.
investigating
Hello, We are investigating an issue when certain file does not finish uploading (stuck on waiting).
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