diff --git a/index.php b/index.php
index 5cccab8f..d3e9b76d 100644
--- a/index.php
+++ b/index.php
@@ -165,27 +165,33 @@ if ($action == '2fa_entercode') {
 		$loginname = Validate::validate($_POST['loginname'], 'loginname');
 		$password = Validate::validate($_POST['password'], 'password');
 
-		$stmt = Database::prepare("SELECT `loginname` AS `customer` FROM `" . TABLE_PANEL_CUSTOMERS . "`
-			WHERE `loginname`= :loginname");
+		$stmt = Database::prepare("
+			SELECT `loginname` AS `customer`
+			FROM `" . TABLE_PANEL_CUSTOMERS . "`
+			WHERE `loginname`= :loginname
+			AND `gui_access` = 1
+		");
 		Database::pexecute($stmt, [
 			"loginname" => $loginname
 		]);
 		$row = $stmt->fetch(PDO::FETCH_ASSOC);
 
+		$is_admin = false;
 		if ($row && $row['customer'] == $loginname) {
 			$table = "`" . TABLE_PANEL_CUSTOMERS . "`";
 			$uid = 'customerid';
 			$adminsession = '0';
-			$is_admin = false;
 		} else {
-			$is_admin = true;
 			if ((int)Settings::Get('login.domain_login') == 1) {
 				$domainname = $idna_convert->encode(preg_replace([
 					'/\:(\d)+$/',
 					'/^https?\:\/\//'
 				], '', $loginname));
-				$stmt = Database::prepare("SELECT `customerid` FROM `" . TABLE_PANEL_DOMAINS . "`
-					WHERE `domain` = :domain");
+				$stmt = Database::prepare("
+					SELECT `customerid`
+					FROM `" . TABLE_PANEL_DOMAINS . "`
+					WHERE `domain` = :domain
+				");
 				Database::pexecute($stmt, [
 					"domain" => $domainname
 				]);
@@ -194,8 +200,11 @@ if ($action == '2fa_entercode') {
 				if (isset($row2['customerid']) && $row2['customerid'] > 0) {
 					$loginname = Customer::getCustomerDetail($row2['customerid'], 'loginname');
 					if ($loginname !== false) {
-						$stmt = Database::prepare("SELECT `loginname` AS `customer` FROM `" . TABLE_PANEL_CUSTOMERS . "`
-							WHERE `loginname`= :loginname");
+						$stmt = Database::prepare("
+							SELECT `loginname` AS `customer`
+							FROM `" . TABLE_PANEL_CUSTOMERS . "`
+							WHERE `loginname`= :loginname
+						");
 						Database::pexecute($stmt, [
 							"loginname" => $loginname
 						]);
@@ -204,10 +213,11 @@ if ($action == '2fa_entercode') {
 							$table = "`" . TABLE_PANEL_CUSTOMERS . "`";
 							$uid = 'customerid';
 							$adminsession = '0';
-							$is_admin = false;
 						}
 					}
 				}
+			} else {
+				$is_admin = true;
 			}
 		}
 
@@ -218,9 +228,11 @@ if ($action == '2fa_entercode') {
 
 		if ($is_admin) {
 			if (Froxlor::hasUpdates() || Froxlor::hasDbUpdates()) {
-				$stmt = Database::prepare("SELECT `loginname` AS `admin` FROM `" . TABLE_PANEL_ADMINS . "`
+				$stmt = Database::prepare("
+					SELECT `loginname` AS `admin` FROM `" . TABLE_PANEL_ADMINS . "`
 					WHERE `loginname`= :loginname
-					AND `change_serversettings` = '1'");
+					AND `change_serversettings` = '1'
+				");
 				Database::pexecute($stmt, [
 					"loginname" => $loginname
 				]);
@@ -231,8 +243,12 @@ if ($action == '2fa_entercode') {
 					exit();
 				}
 			} else {
-				$stmt = Database::prepare("SELECT `loginname` AS `admin` FROM `" . TABLE_PANEL_ADMINS . "`
-					WHERE `loginname`= :loginname");
+				$stmt = Database::prepare("
+					SELECT `loginname` AS `admin`
+					FROM `" . TABLE_PANEL_ADMINS . "`
+					WHERE `loginname`= :loginname
+					AND `gui_access` = 1
+				");
 				Database::pexecute($stmt, [
 					"loginname" => $loginname
 				]);
@@ -257,8 +273,9 @@ if ($action == '2fa_entercode') {
 			}
 		}
 
-		$userinfo_stmt = Database::prepare("SELECT * FROM $table
-			WHERE `loginname`= :loginname");
+		$userinfo_stmt = Database::prepare("
+			SELECT * FROM $table WHERE `loginname`= :loginname
+		");
 		Database::pexecute($userinfo_stmt, [
 			"loginname" => $loginname
 		]);
@@ -281,9 +298,11 @@ if ($action == '2fa_entercode') {
 			} else {
 				// login correct
 				// reset loginfail_counter, set lastlogin_succ
-				$stmt = Database::prepare("UPDATE $table
-					  SET `lastlogin_succ`= :lastlogin_succ, `loginfail_count`='0'
-					  WHERE `$uid`= :uid");
+				$stmt = Database::prepare("
+					UPDATE $table
+					SET `lastlogin_succ`= :lastlogin_succ, `loginfail_count`='0'
+					WHERE `$uid`= :uid
+				");
 				Database::pexecute($stmt, [
 					"lastlogin_succ" => time(),
 					"uid" => $userinfo[$uid]
@@ -293,9 +312,11 @@ if ($action == '2fa_entercode') {
 			}
 		} else {
 			// login incorrect
-			$stmt = Database::prepare("UPDATE $table
+			$stmt = Database::prepare("
+				UPDATE $table
 				SET `lastlogin_fail`= :lastlogin_fail, `loginfail_count`=`loginfail_count`+1
-				WHERE `$uid`= :uid");
+				WHERE `$uid`= :uid
+			");
 			Database::pexecute($stmt, [
 				"lastlogin_fail" => time(),
 				"uid" => $userinfo[$uid]
diff --git a/install/froxlor.sql.php b/install/froxlor.sql.php
index f5d9517d..c58a59f7 100644
--- a/install/froxlor.sql.php
+++ b/install/froxlor.sql.php
@@ -159,6 +159,7 @@ CREATE TABLE `panel_admins` (
   `type_2fa` tinyint(1) NOT NULL default '0',
   `data_2fa` varchar(25) NOT NULL default '',
   `api_allowed` tinyint(1) NOT NULL default '1',
+  `gui_access` tinyint(1) NOT NULL default '1',
    PRIMARY KEY  (`adminid`),
    UNIQUE KEY `loginname` (`loginname`)
 ) ENGINE=InnoDB CHARSET=utf8 COLLATE=utf8_general_ci ROW_FORMAT=DYNAMIC;
@@ -227,6 +228,7 @@ CREATE TABLE `panel_customers` (
   `api_allowed` tinyint(1) NOT NULL default '1',
   `logviewenabled` tinyint(1) NOT NULL default '0',
   `allowed_mysqlserver` text NOT NULL,
+  `gui_access` tinyint(1) NOT NULL default '1',
    PRIMARY KEY  (`customerid`),
    UNIQUE KEY `loginname` (`loginname`)
 ) ENGINE=InnoDB CHARSET=utf8 COLLATE=utf8_general_ci ROW_FORMAT=DYNAMIC;
diff --git a/install/updates/froxlor/update_2.2.inc.php b/install/updates/froxlor/update_2.2.inc.php
index 62913e12..4b1a6309 100644
--- a/install/updates/froxlor/update_2.2.inc.php
+++ b/install/updates/froxlor/update_2.2.inc.php
@@ -77,6 +77,10 @@ if (Froxlor::isFroxlorVersion('2.1.4')) {
 		Update::lastStepStatus(1, '!!!');
 	}
 
+	Update::showUpdateStep("Enhancing admin and user table");
+	Database::query("ALTER TABLE `" . TABLE_PANEL_ADMINS . "` ADD `gui_access` tinyint(1) NOT NULL default '1';");
+	Database::query("ALTER TABLE `" . TABLE_PANEL_CUSTOMERS . "` ADD `gui_access` tinyint(1) NOT NULL default '1';");
+	Update::lastStepStatus(0);
 
 	$to_clean = [
 		'actions/admin/settings/180.dkim.php',
diff --git a/lib/Froxlor/Api/Commands/Admins.php b/lib/Froxlor/Api/Commands/Admins.php
index 8f919a9c..34600617 100644
--- a/lib/Froxlor/Api/Commands/Admins.php
+++ b/lib/Froxlor/Api/Commands/Admins.php
@@ -146,6 +146,8 @@ class Admins extends ApiCommand implements ResourceEntity
 	 *            optional, default auto-generated
 	 * @param string $def_language
 	 *            optional, default is system-default language
+	 * @param bool $gui_access
+	 *            optional, allow login via webui, if false ONLY the login via webui is disallowed; default true
 	 * @param bool $api_allowed
 	 *            optional, default is true if system setting api.enabled is true, else false
 	 * @param string $custom_notes
@@ -219,6 +221,7 @@ class Admins extends ApiCommand implements ResourceEntity
 
 			// parameters
 			$def_language = $this->getParam('def_language', true, Settings::Get('panel.standardlanguage'));
+			$gui_access = $this->getBoolParam('gui_access', true, true);
 			$api_allowed = $this->getBoolParam('api_allowed', true, Settings::Get('api.enabled'));
 			$custom_notes = $this->getParam('custom_notes', true, '');
 			$custom_notes_show = $this->getBoolParam('custom_notes_show', true, 0);
@@ -316,6 +319,7 @@ class Admins extends ApiCommand implements ResourceEntity
 					'name' => $name,
 					'email' => $email,
 					'lang' => $def_language,
+					'gui_access' => $gui_access,
 					'api_allowed' => $api_allowed,
 					'change_serversettings' => $change_serversettings,
 					'customers' => $customers,
@@ -344,6 +348,7 @@ class Admins extends ApiCommand implements ResourceEntity
 					`name` = :name,
 					`email` = :email,
 					`def_language` = :lang,
+					`gui_access` = :gui_access,
 					`api_allowed` = :api_allowed,
 					`change_serversettings` = :change_serversettings,
 					`customers` = :customers,
@@ -431,6 +436,8 @@ class Admins extends ApiCommand implements ResourceEntity
 	 *            optional, default auto-generated
 	 * @param string $def_language
 	 *            optional, default is system-default language
+	 * @param bool $gui_access
+	 * *            optional, allow login via webui, if false ONLY the login via webui is disallowed; default true
 	 * @param bool $api_allowed
 	 *            optional, default is true if system setting api.enabled is true, else false
 	 * @param string $custom_notes
@@ -524,6 +531,7 @@ class Admins extends ApiCommand implements ResourceEntity
 
 				// you cannot edit some of the details of yourself
 				if ($result['adminid'] == $this->getUserDetail('adminid')) {
+					$gui_access = $result['gui_access'];
 					$api_allowed = $result['api_allowed'];
 					$deactivated = $result['deactivated'];
 					$customers = $result['customers'];
@@ -542,6 +550,7 @@ class Admins extends ApiCommand implements ResourceEntity
 					$traffic = $result['traffic'];
 					$ipaddress = ($result['ip'] != -1 ? json_decode($result['ip'], true) : -1);
 				} else {
+					$gui_access = $this->getBoolParam('gui_access', true, $result['gui_access']);
 					$api_allowed = $this->getBoolParam('api_allowed', true, $result['api_allowed']);
 					$deactivated = $this->getBoolParam('deactivated', true, $result['deactivated']);
 
@@ -665,6 +674,7 @@ class Admins extends ApiCommand implements ResourceEntity
 						'name' => $name,
 						'email' => $email,
 						'lang' => $def_language,
+						'gui_access' => $gui_access,
 						'api_allowed' => $api_allowed,
 						'change_serversettings' => $change_serversettings,
 						'customers' => $customers,
@@ -694,6 +704,7 @@ class Admins extends ApiCommand implements ResourceEntity
 						`name` = :name,
 						`email` = :email,
 						`def_language` = :lang,
+						`gui_access` = :gui_access,
 						`api_allowed` = :api_allowed,
 						`change_serversettings` = :change_serversettings,
 						`customers` = :customers,
diff --git a/lib/Froxlor/Api/Commands/Customers.php b/lib/Froxlor/Api/Commands/Customers.php
index e6cb2c0f..240daf21 100644
--- a/lib/Froxlor/Api/Commands/Customers.php
+++ b/lib/Froxlor/Api/Commands/Customers.php
@@ -191,6 +191,8 @@ class Customers extends ApiCommand implements ResourceEntity
 	 *                             optional
 	 * @param string $def_language ,
 	 *                             optional, default is system-default language
+	 * @param bool $gui_access
+	 *                             optional, allow login via webui, if false ONLY the login via webui is disallowed; default true
 	 * @param bool $api_allowed
 	 *                             optional, default is true if system setting api.enabled is true, else false
 	 * @param int $gender
@@ -297,6 +299,7 @@ class Customers extends ApiCommand implements ResourceEntity
 				$fax = $this->getParam('fax', true, '');
 				$customernumber = $this->getParam('customernumber', true, '');
 				$def_language = $this->getParam('def_language', true, Settings::Get('panel.standardlanguage'));
+				$gui_access = $this->getBoolParam('gui_access', true, 1);
 				$api_allowed = $this->getBoolParam('api_allowed', true, (Settings::Get('api.enabled') && Settings::Get('api.customer_default')));
 				$gender = (int)$this->getParam('gender', true, 0);
 				$custom_notes = $this->getParam('custom_notes', true, '');
@@ -515,6 +518,7 @@ class Customers extends ApiCommand implements ResourceEntity
 						'email' => $email,
 						'customerno' => $customernumber,
 						'lang' => $def_language,
+						'gui_access' => $gui_access,
 						'api_allowed' => $api_allowed,
 						'docroot' => $documentroot,
 						'guid' => $guid,
@@ -557,6 +561,7 @@ class Customers extends ApiCommand implements ResourceEntity
 						`email` = :email,
 						`customernumber` = :customerno,
 						`def_language` = :lang,
+						`gui_access` = :gui_access,
 						`api_allowed` = :api_allowed,
 						`documentroot` = :docroot,
 						`guid` = :guid,
@@ -948,6 +953,8 @@ class Customers extends ApiCommand implements ResourceEntity
 	 *                             optional
 	 * @param string $def_language ,
 	 *                             optional, default is system-default language
+	 * @param bool $gui_access
+	 *                             optional, allow login via webui, if false ONLY the login via webui is disallowed; default true
 	 * @param bool $api_allowed
 	 *                             optional, default is true if system setting api.enabled is true, else false
 	 * @param int $gender
@@ -1062,6 +1069,7 @@ class Customers extends ApiCommand implements ResourceEntity
 			$fax = $this->getParam('fax', true, $result['fax']);
 			$customernumber = $this->getParam('customernumber', true, $result['customernumber']);
 			$def_language = $this->getParam('def_language', true, $result['def_language']);
+			$gui_access = $this->getBoolParam('gui_access', true, $result['gui_access']);
 			$api_allowed = $this->getBoolParam('api_allowed', true, $result['api_allowed']);
 			$gender = (int)$this->getParam('gender', true, $result['gender']);
 			$custom_notes = $this->getParam('custom_notes', true, $result['custom_notes']);
@@ -1396,6 +1404,7 @@ class Customers extends ApiCommand implements ResourceEntity
 				'logviewenabled' => $logviewenabled,
 				'custom_notes' => $custom_notes,
 				'custom_notes_show' => $custom_notes_show,
+				'gui_access' => $gui_access,
 				'api_allowed' => $api_allowed,
 				'allowed_mysqlserver' => empty($allowed_mysqlserver) ? "" : json_encode($allowed_mysqlserver)
 			];
@@ -1439,6 +1448,7 @@ class Customers extends ApiCommand implements ResourceEntity
 				`logviewenabled` = :logviewenabled,
 				`custom_notes` = :custom_notes,
 				`custom_notes_show` = :custom_notes_show,
+				`gui_access` = :gui_access,
 				`api_allowed` = :api_allowed,
 				`allowed_mysqlserver` = :allowed_mysqlserver";
 			$upd_query .= $admin_upd_query;
diff --git a/lib/formfields/admin/admin/formfield.admin_add.php b/lib/formfields/admin/admin/formfield.admin_add.php
index 71a428b3..632ba58c 100644
--- a/lib/formfields/admin/admin/formfield.admin_add.php
+++ b/lib/formfields/admin/admin/formfield.admin_add.php
@@ -64,6 +64,13 @@ return [
 						'selected' => $userinfo['language']
 
 					],
+					'gui_access' => [
+						'label' => lng('usersettings.gui_access.title'),
+						'desc' => lng('usersettings.gui_access.description'),
+						'type' => 'checkbox',
+						'value' => '1',
+						'checked' => 1,
+					],
 					'api_allowed' => [
 						'label' => lng('usersettings.api_allowed.title'),
 						'desc' => lng('usersettings.api_allowed.description'),
@@ -71,7 +78,7 @@ return [
 						'value' => '1',
 						'checked' => Settings::Get('api.enabled') == '1',
 						'visible' => Settings::Get('api.enabled') == '1'
-					]
+					],
 				]
 			],
 			'section_b' => [
diff --git a/lib/formfields/admin/admin/formfield.admin_edit.php b/lib/formfields/admin/admin/formfield.admin_edit.php
index ef15245d..b9ad3c0c 100644
--- a/lib/formfields/admin/admin/formfield.admin_edit.php
+++ b/lib/formfields/admin/admin/formfield.admin_edit.php
@@ -71,6 +71,14 @@ return [
 						'selected' => $result['def_language'],
 						'visible' => $result['adminid'] != $userinfo['userid']
 					],
+					'gui_access' => [
+						'label' => lng('usersettings.gui_access.title'),
+						'desc' => lng('usersettings.gui_access.description'),
+						'type' => 'checkbox',
+						'value' => '1',
+						'checked' => $result['gui_access'],
+						'visible' => $result['adminid'] != $userinfo['userid']
+					],
 					'api_allowed' => [
 						'label' => lng('usersettings.api_allowed.title'),
 						'desc' => lng('usersettings.api_allowed.description'),
@@ -78,7 +86,7 @@ return [
 						'value' => '1',
 						'checked' => $result['api_allowed'],
 						'visible' => Settings::Get('api.enabled') == '1'
-					]
+					],
 				]
 			],
 			'section_b' => [
diff --git a/lib/formfields/admin/customer/formfield.customer_add.php b/lib/formfields/admin/customer/formfield.customer_add.php
index 6fb740a5..aca33e25 100644
--- a/lib/formfields/admin/customer/formfield.customer_add.php
+++ b/lib/formfields/admin/customer/formfield.customer_add.php
@@ -82,6 +82,13 @@ return [
 						'select_var' => Language::getLanguages(),
 						'selected' => Settings::Get('panel.standardlanguage')
 					],
+					'gui_access' => [
+						'label' => lng('usersettings.gui_access.title'),
+						'desc' => lng('usersettings.gui_access.description'),
+						'type' => 'checkbox',
+						'value' => '1',
+						'checked' => 1
+					],
 					'api_allowed' => [
 						'label' => lng('usersettings.api_allowed.title'),
 						'desc' => lng('usersettings.api_allowed.description'),
diff --git a/lib/formfields/admin/customer/formfield.customer_edit.php b/lib/formfields/admin/customer/formfield.customer_edit.php
index a6ce7c57..0c1639bf 100644
--- a/lib/formfields/admin/customer/formfield.customer_edit.php
+++ b/lib/formfields/admin/customer/formfield.customer_edit.php
@@ -80,6 +80,13 @@ return [
 						'select_var' => Language::getLanguages(),
 						'selected' => $result['def_language']
 					],
+					'gui_access' => [
+						'label' => lng('usersettings.gui_access.title'),
+						'desc' => lng('usersettings.gui_access.description'),
+						'type' => 'checkbox',
+						'value' => '1',
+						'checked' => $result['gui_access'],
+					],
 					'api_allowed' => [
 						'label' => lng('usersettings.api_allowed.title'),
 						'desc' => lng('usersettings.api_allowed.description'),
diff --git a/lib/tablelisting/customer/tablelisting.emails.php b/lib/tablelisting/customer/tablelisting.emails.php
index 64243b01..1b9da26c 100644
--- a/lib/tablelisting/customer/tablelisting.emails.php
+++ b/lib/tablelisting/customer/tablelisting.emails.php
@@ -50,20 +50,20 @@ return [
 				'callback' => [Email::class, 'account'],
 			],
 			'm.spam_tag_level' => [
-				'label' => lng('emails.spam_tag_level'),
+				'label' => lng('antispam.spam_tag_level.title'),
 				'field' => 'spam_tag_level',
 			],
 			'm.spam_kill_level' => [
-				'label' => lng('emails.spam_kill_level'),
+				'label' => lng('antispam.spam_kill_level.title'),
 				'field' => 'spam_kill_level',
 			],
 			'm.bypass_spam' => [
-				'label' => lng('emails.bypass_spam'),
+				'label' => lng('antispam.bypass_spam.title'),
 				'field' => 'bypass_spam',
 				'callback' => [Text::class, 'boolean'],
 			],
 			'm.policy_greylist' => [
-				'label' => lng('emails.policy_greylist'),
+				'label' => lng('antispam.policy_greylist.title'),
 				'field' => 'policy_greylist',
 				'callback' => [Text::class, 'boolean'],
 			],
diff --git a/lng/de.lng.php b/lng/de.lng.php
index b11edeeb..b4c84075 100644
--- a/lng/de.lng.php
+++ b/lng/de.lng.php
@@ -613,11 +613,11 @@ return [
 			'description' => 'Achtung: Änderungen sind nur für neue Schlüssel gültig.<br/><br/>Erfordert einen speziellen DNS Eintrag für die Domain. Wenn das Nameserver-Feature nicht genutzt wird, muss dieser Eintrag manuell verwaltet werden.',
 		],
 		'spam_tag_level' => [
-			'title' => 'Spam Markierungs-Level',
+			'title' => 'Spam Level',
 			'description' => 'Erforderliche Punktzahl zum Markieren einer E-Mail als Spam<br/>Standard: 7.0'
 		],
 		'spam_kill_level' => [
-			'title' => 'Spam Ignorier-Level',
+			'title' => 'Ablehnungs Level',
 			'description' => 'Erforderliche Punktzahl für das Ablehnen einer E-Mail<br/>Standard: 14.0'
 		],
 		'bypass_spam' => [
@@ -2231,6 +2231,10 @@ Vielen Dank, Ihr Administrator',
 			'description' => 'Wenn in den Einstellungen aktiviert, kann der Benutzer API Schlüssel erstellen und auf die froxlor API Zugreifen',
 			'notice' => 'API Zugriff ist für dieses Konto deaktiviert.',
 		],
+		'gui_access' => [
+			'title' => 'WebUI-Anmeldung zulassen',
+			'description' => 'Wenn diese Option deaktiviert ist, kann sich der Benutzer nicht bei der Froxlor-Weboberfläche anmelden, aber alle Dienste (Web, FTP, E-Mail, Datenbanken, API-Zugriff, usw.) funktionieren normal.',
+		],
 	],
 	'install' => [
 		'preflight' => 'System-Prüfung',
diff --git a/lng/en.lng.php b/lng/en.lng.php
index 1fa58d91..c7b82410 100644
--- a/lng/en.lng.php
+++ b/lng/en.lng.php
@@ -2366,6 +2366,10 @@ Yours sincerely, your administrator',
 			'description' => 'When enabled in the settings, this user can create API keys and access the froxlor API',
 			'notice' => 'API access is not allowed for your account.',
 		],
+		'gui_access' => [
+			'title' => 'Allow WebUI login',
+			'description' => 'When disabled, the user cannot log in to the froxlor web-ui but all the services (web, ftp, mail, databases, api-access, etc.) will work normally.',
+		],
 	],
 	'install' => [
 		'slogan' => 'froxlor Server Management Panel',