diff --git a/CHANGELOG b/CHANGELOG
index c0895fcbe5..eaeebb9a6d 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -12,6 +12,9 @@ BACKEND
 DISTRIBUTION
     Fixed: Make sure that sendmail* packages are pre-uninstalled
 
+FRONTEND
+    Readded: Mailboxes quota information (info are retrieved by parsing maildirsize file)
+
 LISTENERS
     Updated: Add Referrer-Policy header to 40_apache2_security_headers.pl listener file
 
diff --git a/configs/debian/frontend/php-fpm.conf b/configs/debian/frontend/php-fpm.conf
index 588e95a285..352a60ece6 100644
--- a/configs/debian/frontend/php-fpm.conf
+++ b/configs/debian/frontend/php-fpm.conf
@@ -23,7 +23,7 @@ pm.max_requests = {FRONTEND_FCGI_MAX_REQUEST}
 chdir = /
 security.limit_extensions = .php .php3 .php4 .php5 .php7 .pht .phtml
 env[TMPDIR] = {WEB_DIR}/data/tmp
-php_admin_value[open_basedir] = {HOME_DIR}/:{CONF_DIR}/:{PEAR_DIR}/:{DISTRO_OPENSSL_CNF}:{DISTRO_CA_BUNDLE}:{RKHUNTER_LOG}:{CHKROOTKIT_LOG}{OTHER_ROOTKIT_LOG}:/proc/:/bin/df:/bin/mount:/dev/random:/dev/urandom
+php_admin_value[open_basedir] = {HOME_DIR}/:{CONF_DIR}/:{PEAR_DIR}/:{MTA_VIRTUAL_MAIL_DIR}/:{DISTRO_OPENSSL_CNF}:{DISTRO_CA_BUNDLE}:{RKHUNTER_LOG}:{CHKROOTKIT_LOG}{OTHER_ROOTKIT_LOG}:/proc/:/bin/df:/bin/mount:/dev/random:/dev/urandom
 php_value[max_execution_time] = 120
 php_value[max_input_time] = 600
 php_value[memory_limit] = 256M
diff --git a/engine/PerlLib/Package/FrontEnd/Installer.pm b/engine/PerlLib/Package/FrontEnd/Installer.pm
index 1ce857ed6a..c419da4300 100644
--- a/engine/PerlLib/Package/FrontEnd/Installer.pm
+++ b/engine/PerlLib/Package/FrontEnd/Installer.pm
@@ -45,6 +45,7 @@ use Net::LibIDN qw/ idn_to_ascii idn_to_unicode /;
 use Package::FrontEnd;
 use Servers::httpd;
 use Servers::named;
+use Servers::mta;
 use version;
 use parent 'Common::SingletonClass';
 
@@ -809,6 +810,9 @@ sub _addMasterWebUser
     }
 
     $rs = iMSCP::SystemUser->new( username => $userName )->addToGroup( $main::imscpConfig{'IMSCP_GROUP'} );
+    $rs = iMSCP::SystemUser->new( username => $userName )->addToGroup(
+        Servers::mta->factory()->{'config'}->{'MTA_MAILBOX_GID_NAME'}
+    );
     $rs ||= iMSCP::SystemUser->new( username => $self->{'config'}->{'HTTPD_USER'} )->addToGroup( $groupName );
     $rs ||= $self->{'eventManager'}->trigger( 'afterHttpdAddUser' );
 }
@@ -932,12 +936,13 @@ sub _buildPhpConfig
             FRONTEND_GROUP            => $group,
             FRONTEND_USER             => $user,
             HOME_DIR                  => $main::imscpConfig{'GUI_ROOT_DIR'},
+            MTA_VIRTUAL_MAIL_DIR      => Servers::mta->factory()->{'config'}->{'MTA_VIRTUAL_MAIL_DIR'},
             PEAR_DIR                  => $self->{'phpConfig'}->{'PHP_PEAR_DIR'},
             OTHER_ROOTKIT_LOG         => $main::imscpConfig{'OTHER_ROOTKIT_LOG'} ne ''
                 ? ":$main::imscpConfig{'OTHER_ROOTKIT_LOG'}" : '',
             RKHUNTER_LOG              => $main::imscpConfig{'RKHUNTER_LOG'},
             TIMEZONE                  => main::setupGetQuestion( 'TIMEZONE' ),
-            WEB_DIR                   => $main::imscpConfig{'GUI_ROOT_DIR'},
+            WEB_DIR                   => $main::imscpConfig{'GUI_ROOT_DIR'}
         },
         {
             destination => "/usr/local/etc/imscp_panel/php-fpm.conf",
diff --git a/gui/library/Functions/Client.php b/gui/library/Functions/Client.php
index 014a406e8f..5dcd015fde 100644
--- a/gui/library/Functions/Client.php
+++ b/gui/library/Functions/Client.php
@@ -520,3 +520,36 @@ function send_alias_order_email($aliasName)
 
     return true;
 }
+
+/**
+ * Get mailbox quota info from the given maildirsize file
+ *
+ * @param string $maildirsizeFilePath
+ * @return array|bool Array containing IMAP quota info on success, FALSE on failure
+ */
+function getMailboxQuotaInfo($maildirsizeFilePath)
+{
+    if (!@is_readable($maildirsizeFilePath)) {
+        return false;
+    }
+
+    $fh = @fopen($maildirsizeFilePath, 'r');
+    if (!$fh) {
+        return false;
+    }
+
+    $info = array(
+        'MAILBOX_QUOTA' => $quota = substr(rtrim(fgets($fh)), 0, -1),
+        'MAILBOX_SIZE'  => 0,
+        'MAILBOX_MSGS'  => 0
+    );
+
+    while (($line = fgets($fh)) !== false) {
+        list($msgsize, $msgcount) = preg_split('/\s+/', $line);
+        $info['MAILBOX_SIZE'] += $msgsize;
+        $info['MAILBOX_MSGS'] += $msgcount;
+    }
+
+    fclose($fh);
+    return $info;
+}
diff --git a/gui/public/client/mail_accounts.php b/gui/public/client/mail_accounts.php
index 6b8d6ace60..00c777ceba 100644
--- a/gui/public/client/mail_accounts.php
+++ b/gui/public/client/mail_accounts.php
@@ -135,6 +135,10 @@ function _client_generateMailAccountsList($tpl, $mainDmnId)
 
 
     $dmnProps = get_domain_default_props($_SESSION['user_id']);
+    
+    $postfixConfig = new iMSCP_Config_Handler_File(
+        utils_normalizePath(iMSCP_Registry::get('config')->CONF_DIR . '/postfix/postfix.data')
+    );
 
     while ($row = $stmt->fetchRow(PDO::FETCH_ASSOC)) {
         list($mailDelete, $mailDeleteScript, $mailEdit, $mailEditScript) = _client_generateUserMailAction(
@@ -155,23 +159,37 @@ function _client_generateMailAccountsList($tpl, $mainDmnId)
             $mailType .= '<br>';
         }
 
+        if((strpos($row['mail_type'], '_mail') !== false)) {
+            list($user, $domain) = explode('@', $row['mail_addr']);
+            $info = getMailboxQuotaInfo(utils_normalizePath(
+                $postfixConfig['MTA_VIRTUAL_MAIL_DIR'] . "/$domain/$user/maildirsize"
+            ));
+
+            if($info !== FALSE) {
+                $mailQuotaInfo = tr(
+                    '%s / %s of %s total available',
+                    bytesHuman($info['MAILBOX_SIZE'], NULL, 0),
+                    bytesHuman($info['MAILBOX_QUOTA'], NULL, 0),
+                    ($dmnProps['mail_quota'] > 0) ? bytesHuman($dmnProps['mail_quota'], NULL, 0) : tr('Unlimited') 
+                );
+            } else {
+                $mailQuotaInfo = tr('Unknown');
+            }
+        } else {
+            $mailQuotaInfo = tr('N/A');
+        }
+
         $tpl->assign(array(
-            'MAIL_ADDR'            => tohtml(decode_idna($mailAddr)),
-            'MAIL_TYPE'            => $mailType,
-            'MAIL_QUOTA_ASSIGMENT' => (is_null($row['quota']))
-                ? tr('N/A')
-                : tohtml(tr('%s of %s',
-                    bytesHuman($row['quota'], NULL, 0),
-                    ($dmnProps['mail_quota'] == 0)
-                        ? tr('Unlimited') : tr('%s total available', bytesHuman($dmnProps['mail_quota'], NULL, 0))
-                )),
-            'MAIL_STATUS'          => translate_dmn_status($row['status']),
-            'MAIL_DELETE'          => $mailDelete,
-            'MAIL_DELETE_SCRIPT'   => $mailDeleteScript,
-            'MAIL_EDIT'            => $mailEdit,
-            'MAIL_EDIT_SCRIPT'     => $mailEditScript,
-            'DEL_ITEM'             => $row['mail_id'],
-            'DISABLED_DEL_ITEM'    => ($row['status'] != 'ok') ? ' disabled' : ''
+            'MAIL_ADDR'          => tohtml(decode_idna($mailAddr)),
+            'MAIL_TYPE'          => $mailType,
+            'MAIL_QUOTA_INFO'    => tohtml($mailQuotaInfo),
+            'MAIL_STATUS'        => translate_dmn_status($row['status']),
+            'MAIL_DELETE'        => $mailDelete,
+            'MAIL_DELETE_SCRIPT' => $mailDeleteScript,
+            'MAIL_EDIT'          => $mailEdit,
+            'MAIL_EDIT_SCRIPT'   => $mailEditScript,
+            'DEL_ITEM'           => $row['mail_id'],
+            'DISABLED_DEL_ITEM'  => ($row['status'] != 'ok') ? ' disabled' : ''
         ));
 
         _client_generateUserMailAutoRespond($tpl, $row['mail_id'], $row['status'], $row['mail_auto_respond']);
@@ -251,7 +269,7 @@ function client_generatePage($tpl)
     'TR_PAGE_TITLE'                        => tr('Client / Email / Overview'),
     'TR_MAIL'                              => tr('Mail'),
     'TR_TYPE'                              => tr('Type'),
-    'TR_QUOTA_ASSIGNMENT'                  => tr('Quota assignment'),
+    'TR_QUOTA_INFO'                        => tr('Quota info'),
     'TR_STATUS'                            => tr('Status'),
     'TR_ACTIONS'                           => tr('Actions'),
     'TR_AUTORESPOND'                       => tr('Auto responder'),
diff --git a/gui/themes/default/client/mail_accounts.tpl b/gui/themes/default/client/mail_accounts.tpl
index c3d570e98d..04b70dd7ca 100644
--- a/gui/themes/default/client/mail_accounts.tpl
+++ b/gui/themes/default/client/mail_accounts.tpl
@@ -64,7 +64,7 @@
         <tr>
             <th>{TR_MAIL}</th>
             <th>{TR_TYPE}</th>
-            <th>{TR_QUOTA_ASSIGNMENT}</th>
+            <th>{TR_QUOTA_INFO}</th>
             <th>{TR_STATUS}</th>
             <th>{TR_ACTIONS}</th>
             <th style="width:21px"><label><input type="checkbox"/></label></th>
@@ -92,7 +92,7 @@
                 <!-- EDP: auto_respond_item -->
             </td>
             <td>{MAIL_TYPE}</td>
-            <td>{MAIL_QUOTA_ASSIGMENT}</td>
+            <td>{MAIL_QUOTA_INFO}</td>
             <td>{MAIL_STATUS}</td>
             <td>
                 <a href="{MAIL_EDIT_SCRIPT}" title="{MAIL_EDIT}" class="icon i_edit">{MAIL_EDIT}</a>