<https://invisioncommunity.com/forums/topic/447293-how-do-i-send-out-an-email-to-specific-member-groups/#comment-2754103>
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"It’s called bulk mail in the ACP and you can filter the receivers by various criteria including member group.\n "
<https://invisioncommunity.com/forums/topic/447293-how-do-i-send-out-an-email-to-specific-member-groups/>