diff --git a/includes/class-form-handler.php b/includes/class-form-handler.php
new file mode 100644
index 0000000..365fe5c
--- /dev/null
+++ b/includes/class-form-handler.php
@@ -0,0 +1,352 @@
+<?php
+/**
+ * Form Handler
+ *
+ * Handles form submissions, validation, CPT storage, and email sending
+ *
+ * @package Umzugsliste
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+/**
+ * Form handler class
+ */
+class Umzugsliste_Form_Handler {
+
+	/**
+	 * Instance
+	 *
+	 * @var Umzugsliste_Form_Handler
+	 */
+	private static $instance = null;
+
+	/**
+	 * Get instance
+	 *
+	 * @return Umzugsliste_Form_Handler
+	 */
+	public static function get_instance() {
+		if ( null === self::$instance ) {
+			self::$instance = new self();
+		}
+		return self::$instance;
+	}
+
+	/**
+	 * Constructor
+	 */
+	private function __construct() {
+		add_action( 'init', array( $this, 'handle_submission' ) );
+	}
+
+	/**
+	 * Handle form submission
+	 */
+	public function handle_submission() {
+		// Check if this is a form submission
+		if ( 'POST' !== $_SERVER['REQUEST_METHOD'] ) {
+			return;
+		}
+
+		if ( ! isset( $_POST['umzugsliste_submit'] ) ) {
+			return;
+		}
+
+		// Verify nonce
+		if ( ! isset( $_POST['umzugsliste_nonce'] ) || ! wp_verify_nonce( $_POST['umzugsliste_nonce'], 'umzugsliste_submit' ) ) {
+			wp_die( 'Security verification failed. Please try again.' );
+		}
+
+		// Verify captcha
+		$captcha = Umzugsliste_Captcha::get_instance();
+		if ( $captcha->is_enabled() ) {
+			$verified = $captcha->verify_response( $_POST );
+			if ( ! $verified ) {
+				$captcha_error = array(
+					'messages' => array( 'Captcha-Verifizierung fehlgeschlagen. Bitte versuchen Sie es erneut.' ),
+					'fields'   => array(),
+				);
+				set_transient( 'umzugsliste_errors_' . session_id(), $captcha_error, 300 );
+				wp_safe_redirect( wp_get_referer() );
+				exit;
+			}
+		}
+
+		// Validate submission
+		$validation_errors = $this->validate_submission( $_POST );
+		if ( ! empty( $validation_errors ) ) {
+			// Store errors in transient for display
+			set_transient( 'umzugsliste_errors_' . session_id(), $validation_errors, 300 );
+			// Redirect back to form
+			wp_safe_redirect( wp_get_referer() );
+			exit;
+		}
+
+		// Sanitize data
+		$data = $this->sanitize_submission( $_POST );
+
+		// Save to CPT
+		$entry_id = $this->save_to_cpt( $data );
+
+		if ( ! $entry_id ) {
+			// Log error but continue
+			error_log( 'Umzugsliste: Failed to save CPT entry' );
+		}
+
+		// Send email
+		$email_sent = $this->send_email( $entry_id, $data );
+
+		if ( ! $email_sent ) {
+			// Email failed - update CPT and show error
+			if ( $entry_id ) {
+				update_post_meta( $entry_id, '_umzugsliste_email_sent', false );
+			}
+
+			// Show error message
+			wp_die(
+				'<h1>E-Mail konnte nicht versendet werden</h1>
+				<p>Ihre Anfrage wurde gespeichert, aber die E-Mail konnte nicht versendet werden.</p>
+				<p><strong>Bitte kontaktieren Sie uns telefonisch:</strong></p>
+				<p>Wiesbaden: <a href="tel:+4961122020">(06 11) 2 20 20</a><br>
+				Mainz: <a href="tel:+49613122141">(0 61 31) 22 21 41</a></p>
+				<p><a href="' . home_url() . '">Zurück zur Startseite</a></p>',
+				'E-Mail-Fehler'
+			);
+		}
+
+		// Redirect to thank you page
+		$this->redirect_to_thank_you( $entry_id );
+	}
+
+	/**
+	 * Validate submission data
+	 *
+	 * @param array $data POST data
+	 * @return array Validation errors (empty if valid)
+	 */
+	private function validate_submission( $data ) {
+		$errors = array();
+
+		// Required fields
+		$required_fields = array(
+			'bName'     => 'Name (Beladeadresse)',
+			'bStrasse'  => 'Straße (Beladeadresse)',
+			'bort'      => 'PLZ/Ort (Beladeadresse)',
+			'bTelefon'  => 'Telefon (Beladeadresse)',
+			'eName'     => 'Name (Entladeadresse)',
+			'eStrasse'  => 'Straße (Entladeadresse)',
+			'eort'      => 'PLZ/Ort (Entladeadresse)',
+		);
+
+		foreach ( $required_fields as $field => $label ) {
+			if ( empty( $data[ $field ] ) ) {
+				$errors[] = 'Pflichtfeld fehlt: ' . $label;
+			}
+		}
+
+		// Validate email if provided
+		if ( ! empty( $data['info']['eE-Mail'] ) && ! is_email( $data['info']['eE-Mail'] ) ) {
+			$errors[] = 'Ungültige E-Mail-Adresse';
+		}
+
+		// Validate date
+		if ( empty( $data['day'] ) || empty( $data['month'] ) || empty( $data['year'] ) ) {
+			$errors[] = 'Umzugstermin fehlt';
+		}
+
+		// Check if at least one furniture item has quantity
+		$has_items = false;
+		$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';
+			}
+
+			if ( ! empty( $data[ $post_array_name ] ) ) {
+				foreach ( $data[ $post_array_name ] as $key => $value ) {
+					if ( substr( $key, 0, 1 ) === 'v' && ! empty( $value ) && floatval( $value ) > 0 ) {
+						$has_items = true;
+						break 2;
+					}
+				}
+			}
+		}
+
+		if ( ! $has_items ) {
+			$errors[] = 'Bitte geben Sie mindestens eine Möbelmenge ein';
+		}
+
+		return $errors;
+	}
+
+	/**
+	 * Sanitize submission data
+	 *
+	 * @param array $data POST data
+	 * @return array Sanitized data
+	 */
+	private function sanitize_submission( $data ) {
+		$sanitized = array();
+
+		// Sanitize simple text fields
+		$text_fields = array( 'bName', 'eName', 'bStrasse', 'eStrasse', 'bort', 'eort', 'bTelefon', 'eTelefon', 'day', 'month', 'year' );
+
+		foreach ( $text_fields as $field ) {
+			$sanitized[ $field ] = isset( $data[ $field ] ) ? sanitize_text_field( $data[ $field ] ) : '';
+		}
+
+		// Sanitize info array
+		if ( ! empty( $data['info'] ) && is_array( $data['info'] ) ) {
+			$sanitized['info'] = array();
+			foreach ( $data['info'] as $key => $value ) {
+				if ( 'eE-Mail' === $key ) {
+					$sanitized['info'][ $key ] = sanitize_email( $value );
+				} else {
+					$sanitized['info'][ $key ] = sanitize_text_field( $value );
+				}
+			}
+		}
+
+		// Sanitize room arrays
+		$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';
+			}
+
+			if ( ! empty( $data[ $post_array_name ] ) && is_array( $data[ $post_array_name ] ) ) {
+				$sanitized[ $post_array_name ] = array();
+				foreach ( $data[ $post_array_name ] as $key => $value ) {
+					$sanitized[ $post_array_name ][ $key ] = sanitize_text_field( $value );
+				}
+			}
+		}
+
+		return $sanitized;
+	}
+
+	/**
+	 * Save submission to CPT
+	 *
+	 * @param array $data Sanitized form data
+	 * @return int|false Post ID on success, false on failure
+	 */
+	private function save_to_cpt( $data ) {
+		$customer_name = $data['bName'] ?? 'Unbekannt';
+		$date_string = ( $data['day'] ?? '' ) . '.' . ( $data['month'] ?? '' ) . '.' . ( $data['year'] ?? '' );
+
+		// Calculate total CBM
+		$total_cbm = 0;
+		$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';
+			}
+
+			$room_data = $data[ $post_array_name ] ?? array();
+
+			foreach ( $room_data as $key => $value ) {
+				if ( substr( $key, 0, 1 ) === 'v' && ! empty( $value ) && floatval( $value ) > 0 ) {
+					$item_name = substr( $key, 1 );
+					$quantity = floatval( str_replace( ',', '.', trim( $value ) ) );
+					$cbm = isset( $room_data[ 'q' . $item_name ] ) ? floatval( $room_data[ 'q' . $item_name ] ) : 0;
+					$total_cbm += ( $quantity * $cbm );
+				}
+			}
+		}
+
+		// Create post
+		$post_id = wp_insert_post(
+			array(
+				'post_title'   => 'Anfrage vom ' . $date_string . ' - ' . $customer_name,
+				'post_content' => wp_json_encode( $data ),
+				'post_status'  => 'publish',
+				'post_type'    => 'umzugsliste_entry',
+			)
+		);
+
+		if ( ! is_wp_error( $post_id ) && $post_id ) {
+			// Add meta data
+			update_post_meta( $post_id, '_umzugsliste_customer_name', $customer_name );
+			update_post_meta( $post_id, '_umzugsliste_customer_email', $data['info']['eE-Mail'] ?? '' );
+			update_post_meta( $post_id, '_umzugsliste_moving_date', $date_string );
+			update_post_meta( $post_id, '_umzugsliste_total_cbm', number_format( $total_cbm, 2, '.', '' ) );
+			update_post_meta( $post_id, '_umzugsliste_submission_ip', $_SERVER['REMOTE_ADDR'] ?? '' );
+
+			return $post_id;
+		}
+
+		return false;
+	}
+
+	/**
+	 * Send email via wp_mail()
+	 *
+	 * @param int   $entry_id CPT entry ID
+	 * @param array $data Form data
+	 * @return bool True on success
+	 */
+	private function send_email( $entry_id, $data ) {
+		// Generate email HTML
+		$email_html = Umzugsliste_Email_Generator::generate( $data );
+
+		// Get receiver email from settings
+		$to = get_option( 'umzugsliste_receiver_email', get_option( 'admin_email' ) );
+
+		// Subject
+		$subject = 'Internetanfrage - Anfrage vom ' . date( 'd.m.Y H:i' );
+
+		// Headers
+		$headers = array( 'Content-Type: text/html; charset=UTF-8' );
+
+		// Add Reply-To if customer email provided
+		$customer_email = $data['info']['eE-Mail'] ?? '';
+		if ( ! empty( $customer_email ) && is_email( $customer_email ) ) {
+			$customer_name = $data['bName'] ?? 'Kunde';
+			$headers[] = 'Reply-To: ' . $customer_name . ' <' . $customer_email . '>';
+		}
+
+		// Send email
+		$sent = wp_mail( $to, $subject, $email_html, $headers );
+
+		// Update CPT meta
+		if ( $entry_id ) {
+			update_post_meta( $entry_id, '_umzugsliste_email_sent', $sent );
+			if ( $sent ) {
+				update_post_meta( $entry_id, '_umzugsliste_email_sent_at', current_time( 'mysql' ) );
+			}
+		}
+
+		return $sent;
+	}
+
+	/**
+	 * Redirect to thank you page
+	 *
+	 * @param int $entry_id CPT entry ID
+	 */
+	private function redirect_to_thank_you( $entry_id ) {
+		$thank_you_url = get_option( 'umzugsliste_thankyou_url', home_url() );
+
+		// Add query parameters
+		$redirect_url = add_query_arg(
+			array(
+				'umzugsliste' => 'success',
+				'entry'       => $entry_id,
+			),
+			$thank_you_url
+		);
+
+		wp_safe_redirect( $redirect_url );
+		exit;
+	}
+}