I am guessing but i assume the following help text should be $DEFAULT_RECIPIENTS not $DEFAULT_RECIPIENT_LIST.
      https://github.com/jenkinsci/email-ext-plugin/blob/master/src/main/webapp/help/globalConfig/defaultRecipients.html

          [JENKINS-11680] Default Recipients: misleading help text

          Spencer Oliver created issue -
          Alex Earl made changes -
          Assignee New: Alex Earl [ slide_o_mix ]

          Alex Earl added a comment -

          Alex Earl added a comment - Fixed in https://github.com/jenkinsci/email-ext-plugin/commit/6e3beb5c6a991e8e67eeb41d8904d756107f26fa
          Alex Earl made changes -
          Resolution New: Fixed [ 1 ]
          Status Original: Open [ 1 ] New: Resolved [ 5 ]
          R. Tyler Croy made changes -
          Workflow Original: JNJira [ 141923 ] New: JNJira + In-Review [ 189881 ]

            slide_o_mix Alex Earl
            ntfreak Spencer Oliver
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              Updated:
              Resolved: