signing_stats — control how signing statistics are recorded
signing_stats = "all"
signing_stats = "global"
signing_stats = "off"
This option is used to control whether signing statistics are recorded per binding, as a global summary only, or disabled entirely. You might consider setting this option to
off if you have a very large number of bindings and do not need to track message signing statistics such as DKIM on a per-binding basis.
Default value is
signing_stats is valid in the global scope.