Keeping your Slack workspace professional and peaceful sometimes means knowing how to set boundaries. Let’s walk through exactly how to block someone on Slack and understand when it might be necessary.
Understanding Slack Blocking in 2025
Blocking someone on Slack works a bit differently than on social media. When you block a user, they can still see your messages in shared channels, but they won’t be able to send you direct messages or mention you. Think of it as creating a professional distance rather than a complete cut-off.
Step-by-Step Blocking Process
1. Open the direct message with the person you want to block
2. Click their name at the top of the conversation
3. Select “More” from the dropdown menu
4. Choose “Block user messages”
5. Confirm your choice when prompted
I’ve helped numerous teams navigate workplace communication, and I can tell you that blocking should really be your last resort. Before taking this step, consider having a conversation with your HR department or trying to address the issue directly.
When Should You Block Someone?
In my experience working with various organizations, these are the most common legitimate reasons to block:
• Persistent unwanted messages
• Harassment or inappropriate behavior
• Spam from external users
• Maintaining focus when dealing with overly chatty colleagues
What Happens After Blocking
Once you’ve blocked someone, here’s what changes:
– They can’t start new direct messages with you
– They can’t mention you in channels
– Existing DM history remains visible to both parties
– You’ll both still see each other’s messages in shared channels
Professional Alternatives to Blocking
Before hitting that block button, consider these alternatives I’ve seen work well:
1. Adjust your notification settings
2. Use Slack’s “Do Not Disturb” mode
3. Have a frank discussion about communication boundaries
4. Involve your team lead or HR if necessary
Remember, Slack is fundamentally a professional tool, and in 2025’s hybrid work environment, maintaining healthy digital boundaries is more important than ever. I’ve found that being direct but professional about communication preferences often resolves issues before blocking becomes necessary.
Unblocking Someone
Changed your mind? No problem. You can always unblock someone by:
1. Going to Preferences
2. Selecting “Privacy & Safety”
3. Finding the blocked users list
4. Clicking “Unblock” next to their name
In my years of helping teams with digital communication, I’ve noticed that blocking is rarely needed when clear communication guidelines are established early on. Consider this option carefully, and remember that maintaining professional relationships often requires patience and clear communication rather than immediate blocking.
