Full description
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 but it is possible to supply
your own queries either on the command-line or in a configuration
file.
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.
The default detail report shows the same, but also contains a list
of each individual mailbox (again in alphabetical order) belonging
to the domains.