Restart your Mac and download a fresh copy of the app from the App Store. If the issue persists, launch Finder, go to Applications and remove Slack. Check if Slack can send your messages now. Then click on your Apple menu, select System Preferences, go to System Update and check for updates. Launch the app, click on the Slack menu and select Check for updates. Make sure you’re running the latest Slack app version on your Mac. Launch Slack again, try to send a new message and check if it works. Delete the Cache, Blob Storage, Storage and GPUCache folders. Enter ~/Library/Application Support and scroll down to Slack. Exit Slack, click on the Go menu and select Go to folder. Delete the cache and check if the problem persists. Your app cache might be interfering with your current Slack session. Additionally, you can connect to the Slack web app and check if you can message your contacts via your web browser.

Then restart your router, wait until your Mac and iOS devices go back online and launch Slack again. Disconnect other devices using the same network. Meanwhile, restart your Mac and iOS devices.

Unplug your router’s power cord and wait two minutes. Make sure your connection is stable and you’re not experiencing any bandwidth problems. If Slack is up and running, maybe the problem is on your end. If Slack already acknowledged the messaging problems, wait until the company has fixed the issue and try again. If you’re experiencing intermittent issues with sending messages or you can’t send any messages, check Slack’s service status. The “Slack couldn’t send this message” error indicates the service is affected by major delays when transferring data. Check the Service Statusįrom time to time, Slack’s server may fail to work as intended. Reload the app, paste the message into the chat window and there’s no need to type the same message twice. ⇒ Quick Tip: When you get an alert that Slack failed to send your message, immediately copy the problematic message to your clipboard. Here’s what you can do to fix the problem on Mac.

But the service may sometimes fail to send your messages. Slack handles millions of messages every day allowing you to exchange information and ideas with your teammates and collaborators in real time.

Slack mac app store