doc/DIAGRAM


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              sendmail --------------- mailq
             /        \
            /          \
           /            \
nullmailer-inject  nullmailer-smtpd
           \            /
            \          /
             \        /
          nullmailer-inject
                  |
                  |
                  |
          nullmailer-queue
                  |
                  |
                  |
              QUEUE/tmp -> QUEUE/queue -> QUEUE/failed
                               |
                               |
                               |
                        nullmailer-send ---- nullmailer-dsn
                               |
                               |
                               |
                          BIN/PROTOCOL