=head1 DESCRIPTION
List all known message labels ("mailboxes" in JMAP terminology).
+This is handy for writing L<lei-import(1)> invocations.
=head1 OPTIONS
=over
-=item -z, -0
+=item -z
+
+=item -0
Use C<\0> (NUL) instead of newline (CR) to delimit lines.
-=item -q, --quiet
+=item -q
+
+=item --quiet
Suppress feedback messages.