Table 2
                      Useful sendmail debugging flags
           ----------------------------------------------------
           -d21.2   Shows rewriting of addresses.

           -d21.12  Shows more detailed rewriting of addresses.

            -d60    Shows map lookups.

            -d11    Shows mailer invocations

            -d8.7   Shows DNS chat.

           -d27.4   Shows alias, forward, and include traffic.

           -d28.4   Shows user database traffic.

            -d12    Shows remote name editing.

            -d0.1   Shows compile flags and system identity.

            -d0.4   Shows proving for local names.

           -d0.10   Shows OS-dependent compile flags.