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Outage in Slack

Free Plan Customers Are Experiencing Message Failures

Resolved Minor
October 01, 2026 - Started 5 days ago - Lasted about 6 hours
Official incident page

Incident Report

Summary AI Generated

Slack free plan users were unable to send messages for approximately 6.4 hours after a feature toggle ramp-up caused an app integration to enter a processing loop, generating billions of messages and pushing affected workspaces over their messaging volume threshold. This triggered unexpected message-sending blocks across free plan teams. The root cause was identified and a fix was deployed, with Slack actively monitoring the environment to confirm full restoration.

We're aware that some customers on our free plan are experiencing message-sending limit blocks in an unusual spike pattern, which is preventing them from sending messages. We're investigating why this message limit was triggered unexpectedly for some teams. If you're affected, you may be temporarily unable to send messages until this is resolved.

We'll provide an update in 30 minutes or sooner if additional information becomes available.

Components affected
Slack Messaging

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Latest Updates ( sorted recent to last )
4 days ago - at 10/01/2026 06:52PM

Deployment of the fix is underway to restore access for impacted free plan workspaces, and we are actively monitoring the environment. More information will follow as we progress through this stage of remediation. 

5 days ago - at 10/01/2026 02:31PM

We’ve identified a potential fix for this issue and we’re working on getting this out to users as quickly as possible. We’ll be back once we have another update to share.

Thank you for your continued patience as we work towards a solution.

5 days ago - at 10/01/2026 01:58PM

A feature toggle ramp-up caused an app integration to repeatedly post messages in a processing loop. This pushed free plan customers over the message volume threshold, triggering the sending block. We're working to restore access and are actively working on remediation options for impacted Workspaces. 

We apologize for the inconvenience and will provide another update as soon as we have more details to share. 

5 days ago - at 10/01/2026 12:56PM

We identified that a third-party app is stuck in a loop that has triggered billions of messages. This is causing free plan users to exceed messaging limits. 

We apologize for the inconvenience and will provide another update as soon as we have more details to share. 

5 days ago - at 10/01/2026 12:39PM

We're aware that some customers on our free plan are experiencing message-sending limit blocks in an unusual spike pattern, which is preventing them from sending messages. We're investigating why this message limit was triggered unexpectedly for some teams. If you're affected, you may be temporarily unable to send messages until this is resolved. 

We'll provide an update in 30 minutes or sooner if additional information becomes available.

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