How do I delete text messages from unknown senders in the iMessage app on my MacBook Air?
How do I delete text messages in the iMessage app on my MacBook Air?
[Re-Titled by Moderator]
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You delete them the same way you delete any message. Control (or right) click on them and select "Delete." You can also delete the entire conversation by selecting the conversation in the sidebar and then going to Conversation>Delete Conversation..."