You set up the communication channels that your post creators can enable for content distribution in the Studio. These settings can be found in Administration > Multichannel > Communication channels. You need "Multichannel administration" permission to access the settings.
Timeline
Published posts appear on the timeline of the targeted audience. Additionally, you can decide whether to allow post creators to decide whether commenting or reacting is turned on or off for their posts. If these are turned off, posts won't show the commenting or reacting options at all.
The post is only visible in the newsfeed timeline of each targeted user and not on any page or community timeline, or a user's personal timeline.
Published posts are emailed to the targeted audience. You can view the post's teaser title, image, and text in the email and can select to open the full post on the timeline.
You can use the default sender name and email or set up a custom email address and sender name of your choice.
Learn more in the Email notifications and Custom email address articles.
Slack
Published posts are sent as a Slack app message to the targeted audience. You can view the post's teaser title, image, and text in Slack and can select to open the full post on the timeline.
Learn more in the Settings up a Slack integration article.
Microsoft Teams
Published posts are sent as a Teams app message to the targeted audience. You can view the post's teaser title, image, and text on Teams and can select to open the full post on the timeline.
Learn more in Setting up a Microsoft Teams integration (Multichannel).