Go to phpmyadmin via 'admin > sql manager' and then click vpopmail database. Click SQL and execute:
-- phpMyAdmin SQL Dump
-- version 4.4.2
-- http://www.phpmyadmin.net
--
-- Host: localhost
-- Generation Time: Apr 18, 2015 at 05:32 PM
-- Server version: 10.0.17-MariaDB
-- PHP Version: 5.4.39
SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET time_zone = "+00:00";
/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
--
-- Database: `vpopmail`
--
-- --------------------------------------------------------
--
-- Table structure for table `dir_control`
--
CREATE TABLE IF NOT EXISTS IF NOT EXISTS `dir_control` (
`domain` char(96) CHARACTER SET latin1 NOT NULL,
`cur_users` int(11) DEFAULT NULL,
`level_cur` int(11) DEFAULT NULL,
`level_max` int(11) DEFAULT NULL,
`level_start0` int(11) DEFAULT NULL,
`level_start1` int(11) DEFAULT NULL,
`level_start2` int(11) DEFAULT NULL,
`level_end0` int(11) DEFAULT NULL,
`level_end1` int(11) DEFAULT NULL,
`level_end2` int(11) DEFAULT NULL,
`level_mod0` int(11) DEFAULT NULL,
`level_mod1` int(11) DEFAULT NULL,
`level_mod2` int(11) DEFAULT NULL,
`level_index0` int(11) DEFAULT NULL,
`level_index1` int(11) DEFAULT NULL,
`level_index2` int(11) DEFAULT NULL,
`the_dir` char(160) CHARACTER SET latin1 DEFAULT NULL
) DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
-- --------------------------------------------------------
--
-- Table structure for table `lastauth`
--
CREATE TABLE IF NOT EXISTS IF NOT EXISTS `lastauth` (
`user` char(32) CHARACTER SET latin1 NOT NULL,
`domain` char(96) CHARACTER SET latin1 NOT NULL,
`remote_ip` char(18) CHARACTER SET latin1 NOT NULL,
`timestamp` bigint(20) NOT NULL DEFAULT '0'
) DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
-- --------------------------------------------------------
--
-- Table structure for table `valias`
--
CREATE TABLE IF NOT EXISTS IF NOT EXISTS `valias` (
`alias` char(32) CHARACTER SET latin1 NOT NULL,
`domain` char(96) CHARACTER SET latin1 NOT NULL,
`valias_line` text CHARACTER SET latin1 NOT NULL
) DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
-- --------------------------------------------------------
--
-- Table structure for table `vpopmail`
--
CREATE TABLE IF NOT EXISTS IF NOT EXISTS `vpopmail` (
`pw_name` char(32) CHARACTER SET latin1 NOT NULL,
`pw_domain` char(96) CHARACTER SET latin1 NOT NULL,
`pw_passwd` char(40) CHARACTER SET latin1 DEFAULT NULL,
`pw_uid` int(11) DEFAULT NULL,
`pw_gid` int(11) DEFAULT NULL,
`pw_gecos` char(48) CHARACTER SET latin1 DEFAULT NULL,
`pw_dir` char(160) CHARACTER SET latin1 DEFAULT NULL,
`pw_shell` char(20) CHARACTER SET latin1 DEFAULT NULL,
`pw_clear_passwd` char(16) CHARACTER SET latin1 DEFAULT NULL
) DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
--
-- Indexes for dumped tables
--
--
-- Indexes for table `dir_control`
--
ALTER TABLE `dir_control`
ADD PRIMARY KEY (`domain`);
--
-- Indexes for table `lastauth`
--
ALTER TABLE `lastauth`
ADD PRIMARY KEY (`user`,`domain`);
--
-- Indexes for table `valias`
--
ALTER TABLE `valias`
ADD KEY `alias` (`alias`,`domain`);
--
-- Indexes for table `vpopmail`
--
ALTER TABLE `vpopmail`
ADD PRIMARY KEY (`pw_name`,`pw_domain`);
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
and then run 'sh /script/cleanup'. Check again with vdominfo.