diff --git a/assets/js/form.js b/assets/js/form.js
index ffe8e82..547adc0 100644
--- a/assets/js/form.js
+++ b/assets/js/form.js
@@ -409,7 +409,7 @@
 	function getFieldVal(name) {
 		var el = qs('[name="' + name + '"]');
 		if (!el) return '';
-		if (el.tagName === 'SELECT') return el.options[el.selectedIndex].value;
+		if (el.tagName === 'SELECT') return el.selectedIndex >= 0 ? el.options[el.selectedIndex].value : '';
 		return el.value.trim();
 	}
 
diff --git a/includes/class-admin-menu.php b/includes/class-admin-menu.php
index 7a07541..7b09f57 100644
--- a/includes/class-admin-menu.php
+++ b/includes/class-admin-menu.php
@@ -69,6 +69,16 @@ class Umzugsliste_Admin_Menu {
 			array( $this, 'settings_page' )   // Callback
 		);
 
+		// Add Test Email submenu
+		add_submenu_page(
+			'umzugsliste',
+			'Test Email',
+			'Test Email',
+			'manage_options',
+			'umzugsliste-test-email',
+			array( Umzugsliste_Test_Email::get_instance(), 'render_admin_page' )
+		);
+
 		// Remove duplicate top-level menu item
 		remove_submenu_page( 'umzugsliste', 'umzugsliste' );
 	}
diff --git a/includes/class-form-renderer.php b/includes/class-form-renderer.php
index 18fed1f..076ca78 100644
--- a/includes/class-form-renderer.php
+++ b/includes/class-form-renderer.php
@@ -206,20 +206,99 @@ class Umzugsliste_Form_Renderer {
 				<p class="required-note"><?php echo esc_html__( '* Required fields', 'siegel-umzugsliste' ); ?></p>
 			</div>
 			<?php if ( defined( 'WP_DEBUG' ) && WP_DEBUG ) : ?>
-				<button type="button" id="dev-autofill" class="dev-autofill-btn">&#9881; Fill</button>
+				<button type="button" id="dev-autofill" class="dev-autofill-btn">&#9881; Fill All</button>
 				<script>
 				document.getElementById('dev-autofill').addEventListener('click', function() {
-					var fields = {
-						'bName':'Max Mustermann','bStrasse':'Musterstr. 12',
-						'bort':'10115 Berlin','bTelefon':'030 12345678',
-						'eName':'Erika Musterfrau','eStrasse':'Zielweg 5',
-						'eort':'80331 München','info[eE-Mail]':'test@example.com'
-					};
-					for (var n in fields) {
-						var el = document.querySelector('[name="'+n+'"]');
-						if (el) { el.value = fields[n]; el.dispatchEvent(new Event('input',{bubbles:true})); }
+					function setField(name, val) {
+						var el = document.querySelector('[name="'+name+'"]');
+						if (el) { el.value = val; el.dispatchEvent(new Event('input',{bubbles:true})); }
 					}
-					document.getElementById('wizard-next').click();
+					function setRadio(name, val) {
+						var el = document.querySelector('[name="'+name+'"][value="'+val+'"]');
+						if (el) el.checked = true;
+					}
+
+					/* Step 1: Date — option values are plain numbers (no zero-pad) */
+					var d = new Date();
+					setField('umzug_day', String(d.getDate()));
+					setField('umzug_month', String(d.getMonth()+1));
+					setField('umzug_year', String(d.getFullYear()));
+
+					/* Step 1: Addresses */
+					var addr = {
+						'bName':'Max Mustermann','bStrasse':'Musterstraße 42',
+						'bort':'65197 Wiesbaden','bTelefon':'0611 123456',
+						'eName':'Erika Musterfrau','eStrasse':'Beispielweg 7',
+						'eort':'55116 Mainz','eTelefon':'06131 654321',
+						'info[bGeschoss]':'2. OG','info[eGeschoss]':'EG',
+						'info[bTelefax]':'0611 123457','info[eTelefax]':'06131 654322',
+						'info[bMobil]':'0170 1234567','info[eMobil]':'0171 7654321',
+						'info[eE-Mail]':'test@example.com'
+					};
+					for (var n in addr) setField(n, addr[n]);
+					setRadio('info[bLift]','ja');
+
+					/* Steps 2-7: Furniture — ALL items in every room */
+					document.querySelectorAll('.furniture-list').forEach(function(list) {
+						var items = list.querySelectorAll('.furniture-item');
+						for (var i = 0; i < items.length; i++) {
+							var qty = (i % 3) + 1;
+							var inp = items[i].querySelector('.quantity-input');
+							if (inp) {
+								inp.value = String(qty);
+								inp.classList.add('has-value');
+								items[i].classList.add('has-quantity');
+								inp.dispatchEvent(new Event('input',{bubbles:true}));
+							}
+							if (i % 2 === 0) {
+								var mj = items[i].querySelector('.montage-toggle input[value="ja"]');
+								if (mj) mj.checked = true;
+							}
+						}
+					});
+
+					/* Step 8: Additional work — Montage checkboxes */
+					document.querySelectorAll('[data-section="montage"] input[type="checkbox"]').forEach(function(cb) { cb.checked = true; });
+
+					/* Schrank radios — cycle Abbau/Aufbau/Beides */
+					var abbauVals = ['Abbau','Aufbau','Beides'], ai = 0;
+					document.querySelectorAll('[data-section="schrank"] .additional-field-abbau').forEach(function(f) {
+						var r = f.querySelector('input[value="'+abbauVals[ai%3]+'"]');
+						if (r) r.checked = true;
+						ai++;
+					});
+
+					/* Elektriker — check + anzahl */
+					var ez = 1;
+					document.querySelectorAll('[data-section="elektriker"] .additional-field-qty').forEach(function(f) {
+						var cb = f.querySelector('input[type="checkbox"]'); if (cb) cb.checked = true;
+						var q = f.querySelector('.qty-small'); if (q) q.value = String(ez++);
+					});
+
+					/* Dübelarbeiten — check + anzahl */
+					var dz = 2;
+					document.querySelectorAll('[data-section="duebelarbeiten"] .additional-field-qty').forEach(function(f) {
+						var cb = f.querySelector('input[type="checkbox"]'); if (cb) cb.checked = true;
+						var q = f.querySelector('.qty-small'); if (q) { q.value = String(dz); dz += 2; }
+					});
+
+					/* Packarbeiten — all checkboxes + text quantities */
+					document.querySelectorAll('[data-section="packarbeiten"] input[type="checkbox"]').forEach(function(cb) { cb.checked = true; });
+					var pv = [25, 5], pi = 0;
+					document.querySelectorAll('[data-section="packarbeiten"] .additional-field-text .qty-small').forEach(function(inp) {
+						inp.value = String(pv[pi] || 5); pi++;
+					});
+
+					/* Anfahrt — all checkboxes + distances */
+					document.querySelectorAll('[data-section="anfahrt"] input[type="checkbox"]').forEach(function(cb) { cb.checked = true; });
+					var av = [15, 25], avi = 0;
+					document.querySelectorAll('[data-section="anfahrt"] .additional-field-text .qty-small').forEach(function(inp) {
+						inp.value = String(av[avi] || 25); avi++;
+					});
+
+					/* Sonstiges */
+					var s = document.querySelector('[name="sonstiges"]');
+					if (s) s.value = 'Bitte vorsichtig mit dem antiken Schrank im Wohnzimmer.\nDas Klavier muss besonders geschützt werden.';
 				});
 				</script>
 			<?php endif; ?>
diff --git a/includes/class-test-email.php b/includes/class-test-email.php
new file mode 100644
index 0000000..52d028a
--- /dev/null
+++ b/includes/class-test-email.php
@@ -0,0 +1,306 @@
+<?php
+/**
+ * Test Email
+ *
+ * Admin tool for generating and previewing test emails with all fields populated
+ *
+ * @package Umzugsliste
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+/**
+ * Test email class
+ */
+class Umzugsliste_Test_Email {
+
+	/**
+	 * Single instance
+	 *
+	 * @var Umzugsliste_Test_Email
+	 */
+	private static $instance = null;
+
+	/**
+	 * Get instance
+	 *
+	 * @return Umzugsliste_Test_Email
+	 */
+	public static function get_instance() {
+		if ( null === self::$instance ) {
+			self::$instance = new self();
+		}
+		return self::$instance;
+	}
+
+	/**
+	 * Constructor
+	 */
+	private function __construct() {
+		add_action( 'admin_init', array( $this, 'maybe_output_preview' ) );
+	}
+
+	/**
+	 * Intercept preview request before admin page header is output
+	 */
+	public function maybe_output_preview() {
+		if ( ! isset( $_GET['page'] ) || 'umzugsliste-test-email' !== $_GET['page'] ) {
+			return;
+		}
+		if ( ! isset( $_GET['action'] ) || 'preview' !== $_GET['action'] ) {
+			return;
+		}
+		if ( ! current_user_can( 'manage_options' ) ) {
+			wp_die( 'Unauthorized' );
+		}
+
+		switch_to_locale( 'de_DE' );
+		$data = self::generate_test_data();
+		$html = Umzugsliste_Email_Generator::generate( $data );
+		restore_previous_locale();
+
+		echo $html;
+		exit;
+	}
+
+	/**
+	 * Generate comprehensive test data array with every field populated
+	 *
+	 * Must be called within de_DE locale context so __() returns German strings
+	 *
+	 * @return array Complete form submission data
+	 */
+	public static function generate_test_data() {
+		$data = array();
+
+		// Date - today
+		$data['umzug_day']   = date( 'd' );
+		$data['umzug_month'] = date( 'm' );
+		$data['umzug_year']  = date( 'Y' );
+
+		// Address fields - realistic German test values
+		$data['bName']    = 'Max Mustermann';
+		$data['eName']    = 'Erika Musterfrau';
+		$data['bStrasse'] = 'Musterstraße 42';
+		$data['eStrasse'] = 'Beispielweg 7';
+		$data['bort']     = '65197 Wiesbaden';
+		$data['eort']     = '55116 Mainz';
+		$data['bTelefon'] = '0611 123456';
+		$data['eTelefon'] = '06131 654321';
+
+		// Info array
+		$data['info'] = array(
+			'bGeschoss' => '2. OG',
+			'eGeschoss' => 'EG',
+			'bLift'     => 'ja',
+			'eLift'     => 'nein',
+			'bTelefax'  => '0611 123457',
+			'eTelefax'  => '06131 654322',
+			'bMobil'    => '0170 1234567',
+			'eMobil'    => '0171 7654321',
+			'eE-Mail'   => 'test@example.com',
+		);
+
+		// Room data - pick 2-3 items per room with fixed quantities
+		$room_picks = array(
+			'wohnzimmer'       => array( array( 0, 2 ), array( 4, 4 ), array( 8, 1 ) ),
+			'schlafzimmer'     => array( array( 2, 1 ), array( 3, 2 ), array( 5, 2 ) ),
+			'arbeitszimmer'    => array( array( 1, 1 ), array( 3, 2 ), array( 8, 1 ) ),
+			'bad'              => array( array( 0, 1 ), array( 1, 1 ) ),
+			'kueche_esszimmer' => array( array( 4, 1 ), array( 7, 4 ), array( 9, 1 ) ),
+			'kinderzimmer'     => array( array( 2, 1 ), array( 3, 1 ), array( 6, 1 ) ),
+			'keller'           => array( array( 0, 2 ), array( 4, 4 ), array( 8, 1 ) ),
+		);
+
+		$rooms = Umzugsliste_Furniture_Data::get_rooms();
+
+		foreach ( $rooms as $room_key => $room_label ) {
+			$post_array_name = ucfirst( $room_key );
+			if ( 'kueche_esszimmer' === $room_key ) {
+				$post_array_name = 'Kueche_Esszimmer';
+			}
+
+			$furniture_items = Umzugsliste_Furniture_Data::get_furniture_items( $room_key );
+			$picks           = $room_picks[ $room_key ];
+			$room_data       = array();
+
+			foreach ( $picks as $pick ) {
+				$idx      = $pick[0];
+				$quantity = $pick[1];
+
+				if ( isset( $furniture_items[ $idx ] ) ) {
+					$item = $furniture_items[ $idx ];
+					$name = $item['name'];
+
+					$room_data[ 'v' . $name ] = (string) $quantity;
+					$room_data[ 'q' . $name ] = (string) $item['cbm'];
+					$room_data[ 'm' . $name ] = ( $quantity > 2 ) ? 'ja' : 'nein';
+				}
+			}
+
+			$data[ $post_array_name ] = $room_data;
+		}
+
+		// Additional work
+		$sections        = Umzugsliste_Furniture_Data::get_additional_work();
+		$additional_work = array();
+
+		// Montage - both checkboxes checked
+		$montage_data = array();
+		foreach ( $sections['montage']['fields'] as $field ) {
+			$key                = self::get_field_key( $field );
+			$montage_data[ $key ] = 'ja';
+		}
+		$additional_work['montage'] = $montage_data;
+
+		// Schrank - mix of Abbau, Aufbau, Beides
+		$schrank_values = array( 'Abbau', 'Aufbau', 'Beides', 'Abbau', 'Aufbau', 'Beides' );
+		$schrank_data   = array();
+		$i              = 0;
+		foreach ( $sections['schrank']['fields'] as $field ) {
+			$key                = self::get_field_key( $field );
+			$schrank_data[ $key ] = $schrank_values[ $i % count( $schrank_values ) ];
+			$i++;
+		}
+		$additional_work['schrank'] = $schrank_data;
+
+		// Elektriker - all checked with varied _anzahl values
+		$elektriker_data = array();
+		$anzahl          = 1;
+		foreach ( $sections['elektriker']['fields'] as $field ) {
+			$key                             = self::get_field_key( $field );
+			$elektriker_data[ $key ]           = 'ja';
+			$elektriker_data[ $key . '_anzahl' ] = (string) $anzahl;
+			$anzahl++;
+		}
+		$additional_work['elektriker'] = $elektriker_data;
+
+		// Duebelarbeiten - all checked with varied _anzahl values
+		$duebel_data = array();
+		$anzahl      = 2;
+		foreach ( $sections['duebelarbeiten']['fields'] as $field ) {
+			$key                           = self::get_field_key( $field );
+			$duebel_data[ $key ]           = 'ja';
+			$duebel_data[ $key . '_anzahl' ] = (string) $anzahl;
+			$anzahl += 2;
+		}
+		$additional_work['duebelarbeiten'] = $duebel_data;
+
+		// Packarbeiten - all 4 checkboxes checked, text quantities filled
+		$pack_data   = array();
+		$pack_fields = $sections['packarbeiten']['fields'];
+		for ( $i = 0; $i < 4 && $i < count( $pack_fields ); $i++ ) {
+			$key               = self::get_field_key( $pack_fields[ $i ] );
+			$pack_data[ $key ] = 'ja';
+		}
+		for ( $i = 4; $i < 6 && $i < count( $pack_fields ); $i++ ) {
+			$key               = self::get_field_key( $pack_fields[ $i ] );
+			$pack_data[ $key ] = ( $i === 4 ) ? '25' : '5';
+		}
+		$additional_work['packarbeiten'] = $pack_data;
+
+		// Anfahrt - all checkboxes checked + distance text values
+		$anfahrt_data   = array();
+		$anfahrt_fields = $sections['anfahrt']['fields'];
+		foreach ( $anfahrt_fields as $i => $field ) {
+			$key = self::get_field_key( $field );
+			if ( 'checkbox' === $field['type'] ) {
+				$anfahrt_data[ $key ] = 'ja';
+			} else {
+				$anfahrt_data[ $key ] = ( $i === 6 ) ? '15' : '25';
+			}
+		}
+		$additional_work['anfahrt'] = $anfahrt_data;
+
+		$data['additional_work'] = $additional_work;
+
+		// Sonstiges
+		$data['sonstiges'] = "Bitte vorsichtig mit dem antiken Schrank im Wohnzimmer.\nDas Klavier muss besonders geschützt werden.";
+
+		return $data;
+	}
+
+	/**
+	 * Get field key matching email generator logic
+	 *
+	 * @param array $field Field definition
+	 * @return string Field key
+	 */
+	private static function get_field_key( $field ) {
+		if ( ! empty( $field['key'] ) ) {
+			return sanitize_key( $field['key'] );
+		}
+		return sanitize_title( $field['name'] );
+	}
+
+	/**
+	 * Render admin page
+	 */
+	public function render_admin_page() {
+		// Handle send test email
+		$notice = '';
+		if ( isset( $_POST['send_test_email'] ) && check_admin_referer( 'umzugsliste_send_test_email' ) ) {
+			$notice = $this->send_test_email();
+		}
+
+		$preview_url = add_query_arg(
+			array(
+				'page'   => 'umzugsliste-test-email',
+				'action' => 'preview',
+			),
+			admin_url( 'admin.php' )
+		);
+
+		?>
+		<div class="wrap">
+			<h1>Test Email</h1>
+
+			<?php if ( $notice ) : ?>
+				<?php echo $notice; ?>
+			<?php endif; ?>
+
+			<form method="post" style="margin-bottom: 20px;">
+				<?php wp_nonce_field( 'umzugsliste_send_test_email' ); ?>
+				<p>
+					<?php $to = get_option( 'umzugsliste_receiver_email', get_option( 'admin_email' ) ); ?>
+					<strong>Recipient:</strong> <?php echo esc_html( $to ); ?>
+				</p>
+				<p>
+					<?php submit_button( 'Send Test Email', 'primary', 'send_test_email', false ); ?>
+				</p>
+			</form>
+
+			<h2>Email Preview</h2>
+			<iframe
+				src="<?php echo esc_url( $preview_url ); ?>"
+				style="width: 100%; height: 800px; border: 1px solid #ccd0d4; background: #fff;"
+			></iframe>
+		</div>
+		<?php
+	}
+
+	/**
+	 * Send test email
+	 *
+	 * @return string Notice HTML
+	 */
+	private function send_test_email() {
+		switch_to_locale( 'de_DE' );
+		$data = self::generate_test_data();
+		$html = Umzugsliste_Email_Generator::generate( $data );
+		restore_previous_locale();
+
+		$to      = get_option( 'umzugsliste_receiver_email', get_option( 'admin_email' ) );
+		$subject = 'TEST - Internetanfrage - Anfrage vom ' . date( 'd.m.Y H:i' );
+		$headers = array( 'Content-Type: text/html; charset=UTF-8' );
+
+		$sent = wp_mail( $to, $subject, $html, $headers );
+
+		if ( $sent ) {
+			return '<div class="notice notice-success is-dismissible"><p>Test email sent to <strong>' . esc_html( $to ) . '</strong>.</p></div>';
+		}
+		return '<div class="notice notice-error is-dismissible"><p>Failed to send test email. Check your mail configuration.</p></div>';
+	}
+}
diff --git a/umzugsliste.php b/umzugsliste.php
index 88ed162..6f30a06 100644
--- a/umzugsliste.php
+++ b/umzugsliste.php
@@ -84,6 +84,7 @@ class Umzugsliste {
 		require_once UMZUGSLISTE_PLUGIN_DIR . 'includes/class-form-renderer.php';
 		require_once UMZUGSLISTE_PLUGIN_DIR . 'includes/class-shortcode.php';
 		require_once UMZUGSLISTE_PLUGIN_DIR . 'includes/class-email-generator.php';
+		require_once UMZUGSLISTE_PLUGIN_DIR . 'includes/class-test-email.php';
 		require_once UMZUGSLISTE_PLUGIN_DIR . 'includes/class-form-handler.php';
 	}
 
@@ -152,9 +153,10 @@ class Umzugsliste {
 		$cpt = Umzugsliste_CPT::get_instance();
 		$cpt->register_post_type();
 
-		// Initialize admin menu
+		// Initialize admin menu and test email
 		if ( is_admin() ) {
 			Umzugsliste_Admin_Menu::get_instance();
+			Umzugsliste_Test_Email::get_instance();
 		}
 
 		// Initialize settings