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       opendkim - DKIM signing and verifying filter for MTAs


       opendkim  [-A]  [-b modes] [-c canon] [-d domain[,...]]  [-D] [-e name]
       [-f] [-F time] [-k  keyfile]  [-l]  [-L  min]  [-n]  [-o  hdrlist]  [-p
       socketspec]  [-P  pidfile]  [-Q]  [-r]  [-s  selector] [-S signalg] [-t
       testfiles] [-T secs] [-u userid[:group]] [-v] [-V] [-W] [-x configfile]


       opendkim implements the DKIM standard for signing and verifying  e-mail
       messages on a per-domain basis.

       opendkim  uses  the milter interface, originally distributed as part of
       version 8.11 of sendmail(8), to provide DKIM signing  and/or  verifying
       service for mail transiting a milter-aware MTA.

       Most,  if not all, of the command line options listed below can also be
       set using a configuration file.  See the -x option for details.


       Many of the command line and configuration file parameters  will  refer
       to  a  "dataset"  as their values.  This refers to a string that either
       contains the list of desirable values, or to a file that contains them,
       or (if enabled at compile time) a database containing the data.

       Some data sets require that the value contain more than one entry.  How
       this is done depends on which data set type is used.

       Which type is used depends on the format of the  specification  string.
       Note   that  not  all  of  these  are  necessarily  supported  for  all
       installations; most of them depend on the availability of a  particular
       third-party library at compile time.

       In particular:

       a)     If  the  string  begins  with "file:", then the remainder of the
              string is presumed  to  refer  to  a  flat  file  that  contains
              elements  of  the  data  set,  one per line.  If a line contains
              whitespace-separated values, then the line is preusmed to define
              a key and its corresponding value.  Blank lines are ignored, and
              the hash ("#") character denotes the start of a comment.   If  a
              value contains multiple entri