diff --git a/includes/class-siti-stock-supplier-exports.php b/includes/class-siti-stock-supplier-exports.php
index cd294fa..9f9a3ef 100644
--- a/includes/class-siti-stock-supplier-exports.php
+++ b/includes/class-siti-stock-supplier-exports.php
@@ -239,25 +239,28 @@ class Siti_Stock_Supplier_Exports {
 			$config['supplier']
 		);
 
-		$body_lines   = array();
-		$body_lines[] = sprintf(
+		$rows_count = count( $data['rows'] );
+		$body       = '';
+		$body      .= '<p>' . sprintf(
 			/* translators: %s supplier name */
-			__( 'Overzicht voor leverancier %s.', 'siti-stock-plugin' ),
-			$config['supplier']
-		);
-		$body_lines[] = sprintf(
+			esc_html__( 'Overzicht voor leverancier %s.', 'siti-stock-plugin' ),
+			esc_html( $config['supplier'] )
+		) . '</p>';
+		$body      .= '<p>' . sprintf(
 			/* translators: %d total items */
-			__( 'Totaal aantal regels: %d.', 'siti-stock-plugin' ),
-			count( $data['rows'] )
-		);
-		if ( empty( $data['rows'] ) ) {
-			$body_lines[] = __( 'Er zijn geen bestellingen gevonden in de afgelopen 24 uur.', 'siti-stock-plugin' );
-		}
-		$body_lines[] = '';
-		$body_lines[] = $csv;
+			esc_html__( 'Totaal aantal regels: %d.', 'siti-stock-plugin' ),
+			(int) $rows_count
+		) . '</p>';
 
-		$headers = array( 'Content-Type: text/plain; charset=UTF-8' );
-		$sent    = wp_mail( $admin_email, $subject, implode( "\r\n", $body_lines ), $headers );
+		if ( empty( $data['rows'] ) ) {
+			$body .= '<p>' . esc_html__( 'Er zijn geen bestellingen gevonden in de afgelopen 24 uur.', 'siti-stock-plugin' ) . '</p>';
+		} else {
+			$body .= '<p>' . esc_html__( 'CSV-overzicht (kopieer onderstaande tabel):', 'siti-stock-plugin' ) . '</p>';
+			$body .= '<pre style="font-family: monospace; white-space: pre;">' . esc_html( $csv ) . '</pre>';
+		}
+
+		$headers = array( 'Content-Type: text/html; charset=UTF-8' );
+		$sent    = wp_mail( $admin_email, $subject, $body, $headers );
 
 		if ( ! $sent ) {
 			return new WP_Error( 'siti_stock_mail_failed', __( 'E-mail verzenden is mislukt.', 'siti-stock-plugin' ) );