In the postfix script there is a bug: when the logwatch detail level is set to "5" lines with "** Detail (10) * " are printed in the output... When set to detail level "0" these lines are not printed (as expected). I tried to change the default detail level in the postfix script from "10" to "5", but that didn't fix the problem.
Tested on ubuntu with 7.5.6 and with the script from 7.8.
Note: this is my first ever bug report, so please help me to report it in the right way.
Postfix seems to use a different scheme for the detail levels. Each section uses its own detail level. See the [default.]conf/services/postfix.conf file. It is described in more detail under the "Level Limiters" heading.