You can customize the filter to block or allow senders or different message types. When you no longer want to see messages from someone, you can block a sender. Right-click a message from the sender you want to block, and then click Junk > Block Sender.

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Create a shared channel if you want to work with people inside and outside your team or organization. Only team owners can create shared channels. As the team owner who creates the shared channel, you become the channel owner, and the channel inherits labels from the host team.