+Mailbox-count produces a simple count of mailboxes that exist
+per-domain in some SQL database. The default queries are compatible
+with the schema used by PostfixAdmin
+<http://postfixadmin.sourceforge.net/>, but it is possible to supply
+your own queries via the \fI\-\-summary-query\fR and
+\fI\-\-detail-query\fR options.
+.P
+The summary report lists each domain, along with the number of
+mailboxes owned by that domain. The order is determined by the summary
+query, which lists the domains alphabetically by default.
+.P
+The default detail report shows the same, but also contains a list of
+each individual mailbox (again in alphabetical order) belonging to the
+domains.