Send an announcement to a channel
Sometimes your message needs to stand out. With options for a headline and bright background colors, channel announcements help your message cut through noise.
Create an announcement
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In the channel's Posts tab, select Announcement under the box where you type your message.
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Type a headline and change its background color—lots of options!
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Type the topic of your announcement in the Add a subhead area, then add the body of your message and select Post.
Note: Announcement messages are available only in channels—not in group or 1:1 chats.