> ## Documentation Index
> Fetch the complete documentation index at: https://docs.inboxapp.com/llms.txt
> Use this file to discover all available pages before exploring further.

# System lists

> Contacted and Mutual are automatic lists Inboxapp maintains from your messaging history and follows.

System lists are managed automatically by Inboxapp. There are two today:

## Contacted

Everyone you’ve ever messaged across all linked X accounts.

* If someone has multiple accounts, messages from each are included.
* Past outreach history synced into Inboxapp is included as well.

## Mutual

People who follow you and whom you follow back.

## Related

* [How the Contacted list prevents duplicate messaging](/help/leads-management/concepts/how-the-contacted-list-protects-you-from-duplicate-messaging)
* [How Inboxapp syncs your DMs](/help/getting-started-with-inboxapp/how-inboxapp-syncs-your-dms-and-what-to-expect)

Still stuck? Contact support from the app.