diff --git a/install/tpl/apache_ispconfig.vhost.master b/install/tpl/apache_ispconfig.vhost.master
index 4503811ed52c0f7c056d52c486911cad6b7ae9da..6b71378c84781abb8aef0706079a365b0591cad1 100644
--- a/install/tpl/apache_ispconfig.vhost.master
+++ b/install/tpl/apache_ispconfig.vhost.master
@@ -8,101 +8,111 @@ NameVirtualHost *:<tmpl_var name="vhost_port">
 
 <VirtualHost _default_:<tmpl_var name="vhost_port">>
   ServerAdmin webmaster@localhost
-  
+
   <FilesMatch "\.ph(p3?|tml)$">
     SetHandler None
   </FilesMatch>
-  
+
   <IfModule mod_fcgid.c>
     DocumentRoot /var/www/ispconfig/
     SuexecUserGroup ispconfig ispconfig
     <Directory /var/www/ispconfig/>
       Options -Indexes +FollowSymLinks +MultiViews +ExecCGI
       AllowOverride AuthConfig Indexes Limit Options FileInfo
-	  <FilesMatch "\.php$">
-		  SetHandler fcgid-script
-	  </FilesMatch>
+      <FilesMatch "\.php$">
+        SetHandler fcgid-script
+      </FilesMatch>
       FCGIWrapper /var/www/php-fcgi-scripts/ispconfig/.php-fcgi-starter .php
       <tmpl_if name='apache_version' op='>' value='2.2' format='version'>
-	  Require all granted
-	  <tmpl_else>
+      Require all granted
+      <tmpl_else>
       Order allow,deny
       Allow from all
-	  </tmpl_if>
+      </tmpl_if>
     </Directory>
     IPCCommTimeout  7200
-	MaxRequestLen 15728640
+    MaxRequestLen 15728640
   </IfModule>
-  
+
   <IfModule mpm_itk_module>
     DocumentRoot /usr/local/ispconfig/interface/web/
-	AssignUserId ispconfig ispconfig
+    AssignUserId ispconfig ispconfig
     AddType application/x-httpd-php .php
     <Directory /usr/local/ispconfig/interface/web>
       # php_admin_value open_basedir "/usr/local/ispconfig/interface:/usr/share:/tmp"
       Options +FollowSymLinks
       AllowOverride None
       <tmpl_if name='apache_version' op='>' value='2.2' format='version'>
-	  Require all granted
-	  <tmpl_else>
+      Require all granted
+      <tmpl_else>
       Order allow,deny
       Allow from all
-	  </tmpl_if>
-	  php_value magic_quotes_gpc        0
+      </tmpl_if>
+      php_value magic_quotes_gpc        0
     </Directory>
   </IfModule>
-  
+
   # ErrorLog /var/log/apache2/error.log
   # CustomLog /var/log/apache2/access.log combined
   ServerSignature Off
-  
+
   <IfModule mod_security2.c>
     SecRuleEngine Off
   </IfModule>
 
   # SSL Configuration
   <tmpl_var name="ssl_comment">SSLEngine On
+  <tmpl_if name='apache_version' op='>=' value='2.3.16' format='version'>
+  <tmpl_var name="ssl_comment">SSLProtocol All -SSLv3
+  <tmpl_else>
   <tmpl_var name="ssl_comment">SSLProtocol All -SSLv2 -SSLv3
+  </tmpl_if>
   <tmpl_var name="ssl_comment">SSLCertificateFile /usr/local/ispconfig/interface/ssl/ispserver.crt
   <tmpl_var name="ssl_comment">SSLCertificateKeyFile /usr/local/ispconfig/interface/ssl/ispserver.key
   <tmpl_var name="ssl_bundle_comment">SSLCACertificateFile /usr/local/ispconfig/interface/ssl/ispserver.bundle
 
-  <tmpl_var name="ssl_comment">SSLCipherSuite ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES256-GCM-SHA384:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:DES-CBC3-SHA:HIGH:!aNULL:!eNULL:!EXPORT:!DES:!MD5:!PSK:!RC4
+  <tmpl_var name="ssl_comment">SSLCipherSuite ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS
   <tmpl_var name="ssl_comment">SSLHonorCipherOrder On
+  <tmpl_if name='apache_version' op='>=' value='2.4.3' format='version'>
+  <tmpl_var name="ssl_comment">SSLCompression Off
+  </tmpl_if>
+  <tmpl_if name='apache_version' op='>=' value='2.4.11' format='version'>
+  <tmpl_var name="ssl_comment">SSLSessionTickets Off
+  </tmpl_if>
 
   <IfModule mod_headers.c>
     Header always add Strict-Transport-Security "max-age=15768000"
   </IfModule>
 
-<tmpl_if name='apache_version' op='>=' value='2.4' format='version'>
-  <tmpl_var name="ssl_comment">SSLUseStapling on
+  <tmpl_if name='apache_version' op='>=' value='2.3.3' format='version'>
+  <tmpl_var name="ssl_comment">SSLUseStapling On
   <tmpl_var name="ssl_comment">SSLStaplingResponderTimeout 5
-  <tmpl_var name="ssl_comment">SSLStaplingReturnResponderErrors off
-</tmpl_if>
+  <tmpl_var name="ssl_comment">SSLStaplingReturnResponderErrors Off
+  </tmpl_if>
 </VirtualHost>
 
-<tmpl_if name='apache_version' op='>=' value='2.4' format='version'>
+<tmpl_if name='apache_version' op='>=' value='2.3.3' format='version'>
 <IfModule mod_ssl.c>
   <tmpl_var name="ssl_comment">SSLStaplingCache shmcb:/var/run/ocsp(128000)
 </IfModule>
 </tmpl_if>
 
 <Directory /var/www/php-cgi-scripts>
-    AllowOverride None
-	<tmpl_if name='apache_version' op='>' value='2.2' format='version'>
-	Require all denied
-	<tmpl_else>
-    Order Deny,Allow
-    Deny from all
-	</tmpl_if>
+  AllowOverride None
+  <tmpl_if name='apache_version' op='>' value='2.2' format='version'>
+  Require all denied
+  <tmpl_else>
+  Order Deny,Allow
+  Deny from all
+  </tmpl_if>
 </Directory>
 
 <Directory /var/www/php-fcgi-scripts>
-    AllowOverride None
-    <tmpl_if name='apache_version' op='>' value='2.2' format='version'>
-	Require all denied
-	<tmpl_else>
-    Order Deny,Allow
-    Deny from all
-	</tmpl_if>
-</Directory>
\ No newline at end of file
+  AllowOverride None
+  <tmpl_if name='apache_version' op='>' value='2.2' format='version'>
+  Require all denied
+  <tmpl_else>
+  Order Deny,Allow
+  Deny from all
+  </tmpl_if>
+</Directory>
diff --git a/interface/lib/classes/tform_base.inc.php b/interface/lib/classes/tform_base.inc.php
index 1739c1f031babbb3a87b1818380eec4eba4258db..edab62fa36131de8f996200939d19d85a1e036be 100644
--- a/interface/lib/classes/tform_base.inc.php
+++ b/interface/lib/classes/tform_base.inc.php
@@ -973,13 +973,22 @@ class tform_base {
 						$this->errorMessage .= $errmsg."<br />\r\n";
 					}
 				}
+				break;
 			case 'ISEMAIL':
+				$error = false;
 				if($validator['allowempty'] != 'y') $validator['allowempty'] = 'n';
 				if($validator['allowempty'] == 'y' && $field_value == '') {
 					//* Do nothing
 				} else {
 					if(function_exists('filter_var')) {
 						if(filter_var($field_value, FILTER_VALIDATE_EMAIL) === false) {
+							$error = true;
+						} else {
+							if (!preg_match("/^[^\\+]+$/", $field_value)) { // * disallow + in local-part
+								$error = true;
+							}
+						}
+						if ($error) {
 							$errmsg = $validator['errmsg'];
 							if(isset($this->wordbook[$errmsg])) {
 								$this->errorMessage .= $this->wordbook[$errmsg]."<br />\r\n";
@@ -987,8 +996,10 @@ class tform_base {
 								$this->errorMessage .= $errmsg."<br />\r\n";
 							}
 						}
+
 					} else $this->errorMessage .= "function filter_var missing <br />\r\n";
 				}
+				unset($error);
 				break;
 			case 'ISINT':
 				if(function_exists('filter_var') && $field_value < 2147483647) {