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Replying privately:

Via Email:?

You can reply by the footer, as long as your group is set up to allow this.

Via Group Page:?

You can reply by selecting Private (right side below the message box where you are typing). Again this is dependent on your group's settings.

Or you can reply to any group member who has permitted their contact info to be in the Directory - left menu.

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The official Groups.io user documentation is in the Groups.io Help Center.