In an open Messages thread, Command plus Enter on a Mac or Control plus Enter on other keyboards sends the current message. The same action is available through the Send button.
Before using the shortcut, confirm the conversation title and read the final text. It sends immediately through the normal message action; it is not a shortcut for previewing or saving a draft.
Press Enter without the modifier key when you want a line break in the message box. This lets you separate a question from supporting details without sending each line as a separate message.
After sending, check that the message appears in the thread. If the interface is still sending, wait for the result before repeating the shortcut. If an error appears, preserve the text and inspect the thread before retrying. The shortcut applies to the thread composer; the New message dialog has its own Send button and should be completed using that visible action.
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