diff --git a/interface/web/mail/mail_domain_dkim_create.php b/interface/web/mail/mail_domain_dkim_create.php
index fa1e298a31f64ea59a1c899459589d623195d6d8..4769735c60c59070f2bce09cf92bc09f1252890e 100644
--- a/interface/web/mail/mail_domain_dkim_create.php
+++ b/interface/web/mail/mail_domain_dkim_create.php
@@ -124,8 +124,14 @@ function new_selector ($old_selector, $domain) {
 }
 
 //* get dkim-strength for server_id
-$mail_server_id = $app->functions->intval( $app->db->queryOneRecord("SELECT server_id from mail_domain WHERE domain = ?", $_POST['domain']) );
-$dkim_strength = $app->functions->intval( $app->getconf->get_server_config($mail_server_id, 'mail')['dkim_strength'] );
+//$mail_server_id = $app->functions->intval( $app->db->queryOneRecord("SELECT server_id from mail_domain WHERE domain = ?", $_POST['domain']) );
+//$dkim_strength = $app->functions->intval( $app->getconf->get_server_config($mail_server_id, 'mail')['dkim_strength'] );
+$rec = $app->db->queryOneRecord("SELECT server_id from mail_domain WHERE domain = ?", $_POST['domain']);
+$mail_server_id = $app->functions->intval($rec['server_id']);
+unset ($rec);
+$rec = $app->getconf->get_server_config($mail_server_id, 'mail');
+$dkim_strength = $app->functions->intval($rec['dkim_strength']);
+unset ($rec);
 if ( empty($dkim_strength) ) $dkim_strength = 1024;
 
 switch ($_POST['action']) {
diff --git a/interface/web/tools/resync_do.php b/interface/web/tools/resync_do.php
index e0c422beb4e21ea554ad3adc9be17f20c8ac47f8..62d02e06dfa9b54945568d7aaf667e41f38ce70c 100644
--- a/interface/web/tools/resync_do.php
+++ b/interface/web/tools/resync_do.php
@@ -67,7 +67,9 @@ class page_action extends tform_actions {
 					$server_name[$server['server_id']] = $server['server_name'];
 				}
 			} else {
-				$server_name[$server_id] = $app->db->queryOneRecord("SELECT server_name FROM server WHERE server_id = ".$server_id)['server_name'];
+				$temp = $app->db->queryOneRecord("SELECT server_name FROM server WHERE server_id = ".$server_id);
+				$server_name[$server_id] = $temp['server_name'];
+				unset($temp);
 			}
 				
 			if ( isset($tmp_id) ) $server_id = rtrim($tmp_id,',');
@@ -283,7 +285,15 @@ class page_action extends tform_actions {
 			$msg .= '<b>Resynced DNS zone</b><br>';
 			if(is_array($zone_records) && !empty($zone_records)) {
 				foreach($zone_records as $zone_rec) {
-					if ($server_id == -1) $records = query_server('dns_rr', $server_id, $server_type, 'WHERE 1', false)[0]; else $records = query_server('dns_rr', $server_id, $server_type, "WHERE active = 'Y'")[0];
+					if ($server_id == -1) {
+						$temp = query_server('dns_rr', $server_id, $server_type, 'WHERE 1', false);
+						$records = $temp[0];
+						unset($temp);
+					} else {
+						$temp= query_server('dns_rr', $server_id, $server_type, "WHERE active = 'Y'");
+						$records = $temp[0];
+						unset($temp);
+					}
 					$rr_count = 0;
 					if (is_array($records)) {
 						foreach($records as $rec) {
diff --git a/server/lib/classes/cron.d/300-quota_notify.inc.php b/server/lib/classes/cron.d/300-quota_notify.inc.php
index a60f7743ad8b71be596a456e0bcba49ea29e03c7..f18394c58cdef45fdf51592742221e2c054cfe5e 100644
--- a/server/lib/classes/cron.d/300-quota_notify.inc.php
+++ b/server/lib/classes/cron.d/300-quota_notify.inc.php
@@ -50,64 +50,6 @@ class cronjob_quota_notify extends cronjob {
 	public function onRunJob() {
 		global $app, $conf;
 
-		//########
-		// function for sending notification emails
-		//########
-		function send_notification_email($template, $placeholders, $recipients) {
-			global $conf;
-
-			if(!is_array($recipients) || count($recipients) < 1) return false;
-			if(!is_array($placeholders)) $placeholders = array();
-
-			if(file_exists($conf['rootpath'].'/conf-custom/mail/' . $template . '_'.$conf['language'].'.txt')) {
-				$lines = file($conf['rootpath'].'/conf-custom/mail/' . $template . '_'.$conf['language'].'.txt');
-			} elseif(file_exists($conf['rootpath'].'/conf-custom/mail/' . $template . '_en.txt')) {
-				$lines = file($conf['rootpath'].'/conf-custom/mail/' . $template . '_en.txt');
-			} elseif(file_exists($conf['rootpath'].'/conf/mail/' . $template . '_'.$conf['language'].'.txt')) {
-				$lines = file($conf['rootpath'].'/conf/mail/' . $template . '_'.$conf['language'].'.txt');
-			} else {
-				$lines = file($conf['rootpath'].'/conf/mail/' . $template . '_en.txt');
-			}
-
-			//* get mail headers, subject and body
-			$mailHeaders = '';
-			$mailBody = '';
-			$mailSubject = '';
-			$inHeader = true;
-			for($l = 0; $l < count($lines); $l++) {
-				if($lines[$l] == '') {
-					$inHeader = false;
-					continue;
-				}
-				if($inHeader == true) {
-					$parts = explode(':', $lines[$l], 2);
-					if(strtolower($parts[0]) == 'subject') $mailSubject = trim($parts[1]);
-					unset($parts);
-					$mailHeaders .= trim($lines[$l]) . "\n";
-				} else {
-					$mailBody .= trim($lines[$l]) . "\n";
-				}
-			}
-			$mailBody = trim($mailBody);
-
-			//* Replace placeholders
-			$mailHeaders = strtr($mailHeaders, $placeholders);
-			$mailSubject = strtr($mailSubject, $placeholders);
-			$mailBody = strtr($mailBody, $placeholders);
-
-			for($r = 0; $r < count($recipients); $r++) {
-				mail($recipients[$r], $mailSubject, $mailBody, $mailHeaders);
-			}
-
-			unset($mailSubject);
-			unset($mailHeaders);
-			unset($mailBody);
-			unset($lines);
-
-			return true;
-		}
-
-
 		//######################################################################################################
 		// enforce traffic quota (run only on the "master-server")
 		//######################################################################################################
@@ -170,7 +112,7 @@ class cronjob_quota_notify extends cronjob {
 								}
 							}
 
-							send_notification_email('web_traffic_notification', $placeholders, $recipients);
+							$this->_tools->send_notification_email('web_traffic_notification', $placeholders, $recipients);
 						}
 
 					} else {
@@ -290,7 +232,7 @@ class cronjob_quota_notify extends cronjob {
 									$recipients[] = $client['email'];
 								}
 							}
-							send_notification_email('web_quota_ok_notification', $placeholders, $recipients);
+							$this->_tools->send_notification_email('web_quota_ok_notification', $placeholders, $recipients);
 						}
 					} else {
 
@@ -325,7 +267,7 @@ class cronjob_quota_notify extends cronjob {
 									$recipients[] = $client['email'];
 								}
 							}
-							send_notification_email('web_quota_notification', $placeholders, $recipients);
+							$this->_tools->send_notification_email('web_quota_notification', $placeholders, $recipients);
 						}
 					}
 				}
@@ -419,7 +361,7 @@ class cronjob_quota_notify extends cronjob {
 								}
 							}
 
-							send_notification_email('mail_quota_ok_notification', $placeholders, $recipients);
+							$this->_tools->send_notification_email('mail_quota_ok_notification', $placeholders, $recipients);
 						}
 					} else {
 
@@ -454,7 +396,7 @@ class cronjob_quota_notify extends cronjob {
 								}
 							}
 
-							send_notification_email('mail_quota_notification', $placeholders, $recipients);
+							$this->_tools->send_notification_email('mail_quota_notification', $placeholders, $recipients);
 						}
 					}
 				}
@@ -534,7 +476,7 @@ class cronjob_quota_notify extends cronjob {
 										if($web_config['overquota_db_notify_client'] == 'y' && $client['email'] != '') 
 											$recipients[] = $client['email'];
 
-										send_notification_email('db_quota_ok_notification', $placeholders, $recipients);
+										$this->_tools->send_notification_email('db_quota_ok_notification', $placeholders, $recipients);
 
 									}
 
@@ -566,7 +508,7 @@ class cronjob_quota_notify extends cronjob {
 									if($web_config['overquota_db_notify_client'] == 'y' && $client['email'] != '')
 										$recipients[] = $client['email'];
 
-									send_notification_email('db_quota_notification', $placeholders, $recipients);
+									$this->_tools->send_notification_email('db_quota_notification', $placeholders, $recipients);
 
 								}
 
diff --git a/server/lib/classes/cron.d/500-backup_mail.inc.php b/server/lib/classes/cron.d/500-backup_mail.inc.php
index 6c2cb3182841a98c5c707e602f3394a4b0c785f9..8740c5512f884f9dbf8dce0afe844fdc4b78606b 100644
--- a/server/lib/classes/cron.d/500-backup_mail.inc.php
+++ b/server/lib/classes/cron.d/500-backup_mail.inc.php
@@ -83,7 +83,9 @@ class cronjob_backup_mail extends cronjob {
 				foreach($records as $rec) {
 					//* Do the mailbox backup
 					if($rec['backup_interval'] == 'daily' or ($rec['backup_interval'] == 'weekly' && date('w') == 0) or ($rec['backup_interval'] == 'monthly' && date('d') == '01')) {
-						$sql = "SELECT * FROM mail_domain WHERE domain = '".$app->db->quote(explode("@",$rec['email'])[1])."'";
+						$email = $rec['email'][1];
+						$sql="SELECT * FROM mail_domain WHERE domain = ?" . $app->db->quote(explode("@",$email))."'";
+						unset($email);
 						$domain_rec=$app->db->queryOneRecord($sql);
 
 						$mail_backup_dir = $backup_dir.'/mail'.$domain_rec['domain_id'];
diff --git a/server/lib/classes/monitor_tools.inc.php b/server/lib/classes/monitor_tools.inc.php
index ce1debbb640fce8f53d725c5a75ec2a618055dba..c1ac461cb095ab2bc0fea72618570076651c9870 100644
--- a/server/lib/classes/monitor_tools.inc.php
+++ b/server/lib/classes/monitor_tools.inc.php
@@ -675,6 +675,59 @@ class monitor_tools {
 		$app->dbmaster->query($sql);
 	}
 
+	public function send_notification_email($template, $placeholders, $recipients) {
+		global $conf;
+
+		if(!is_array($recipients) || count($recipients) < 1) return false;
+		if(!is_array($placeholders)) $placeholders = array();
+
+		if(file_exists($conf['rootpath'].'/conf-custom/mail/' . $template . '_'.$conf['language'].'.txt')) {
+			$lines = file($conf['rootpath'].'/conf-custom/mail/' . $template . '_'.$conf['language'].'.txt');
+		} elseif(file_exists($conf['rootpath'].'/conf-custom/mail/' . $template . '_en.txt')) {
+			$lines = file($conf['rootpath'].'/conf-custom/mail/' . $template . '_en.txt');
+		} elseif(file_exists($conf['rootpath'].'/conf/mail/' . $template . '_'.$conf['language'].'.txt')) {
+			$lines = file($conf['rootpath'].'/conf/mail/' . $template . '_'.$conf['language'].'.txt');
+		} else {
+			$lines = file($conf['rootpath'].'/conf/mail/' . $template . '_en.txt');
+		}
+
+		//* get mail headers, subject and body
+		$mailHeaders = '';
+		$mailBody = '';
+		$mailSubject = '';
+		$inHeader = true;
+		for($l = 0; $l < count($lines); $l++) {
+			if($lines[$l] == '') {
+				$inHeader = false;
+				continue;
+			}
+			if($inHeader == true) {
+				$parts = explode(':', $lines[$l], 2);
+				if(strtolower($parts[0]) == 'subject') $mailSubject = trim($parts[1]);
+				unset($parts);
+				$mailHeaders .= trim($lines[$l]) . "\n";
+			} else {
+				$mailBody .= trim($lines[$l]) . "\n";
+			}
+		}
+		$mailBody = trim($mailBody);
+
+		//* Replace placeholders
+		$mailHeaders = strtr($mailHeaders, $placeholders);
+		$mailSubject = strtr($mailSubject, $placeholders);
+		$mailBody = strtr($mailBody, $placeholders);
+
+		for($r = 0; $r < count($recipients); $r++) {
+			mail($recipients[$r], $mailSubject, $mailBody, $mailHeaders);
+		}
+
+		unset($mailSubject);
+		unset($mailHeaders);
+		unset($mailBody);
+		unset($lines);
+
+		return true;
+	}
 
 }