MacOS – Sign out of messages on Mac (iMessage)

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I logged into my iMessage account on a friend's Mac but now I can't figure out how to sign out.

How can I secure my messages from appearing on that computer?

Best Answer

You can sign out of the Messages app on OS X as follows:

If you can't access the Mac, then changing your iCloud password or evoking the application specific password for FaceTime and messages would suffice but also be more work for you.