Table 1
                          8.7 Test Mode Extensions
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                 /canon host          Canonify host name.

                 /mx host             Look up MX records.

                 /map mapname key     Do Map lookup.

                 /parse address       Parse address.

                 /try mailer address  Externalize address.

                 /tryflags [HE][SR]   Tweak try.

                 .Dx value            Define macro.

                 .Cc value            Extend class.

                 =Sruleset            Print ruleset.

                 =M                   Print mailers.

                 $m                   Dump macro.

                 $=c                  Dump class.

                 -ddebugflags         Set debug flags.