+#sub _rpop2string {
+# my $rpop = shift;
+# my($priority, $name, $conditions, $actions, $comment) = @$rule;
+# $conditions = join(', ', map { my $a = $_; join(' ', @$a); } @$conditions);
+# $actions = join(', ', map { my $a = $_; join(' ', @$a); } @$actions);
+# ("Mail rule $name" => "$priority IF $conditions THEN $actions ($comment)");
+#}
+