в английском man masqmailconf написано следующее:
online_pipe = file

       This is the name of the executable  which  will  be
       called  to  determine  the online status. This exe-
       cutable should just print the name oif the  current
                                         ^^^^^^ - вроде как \"i\" тут лишняя.

       connection to the standard output and return a zero
       status code. masqmail assumes it is offline if  the
       script returns with a non zero status. Simple exam-
              ple:

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