As with other addressing combinations on the Email page, de-duplication is applied when course teams select multiple recipient groups, so that learners who belong to more than one of the selected groups do not receive more than one copy of the message. (TNL-6162) For more information, see Sending Email Messages to Learners in Different Enrollment Tracks in the Building and Running an edX Course guide or Sending Email Messages to Learners in Different Enrollment Tracks in the Building and Running an Open edX Course guide.