--- a/wp/wp-mail.php	Fri Sep 05 18:40:08 2025 +0200
+++ b/wp/wp-mail.php	Fri Sep 05 18:52:52 2025 +0200
@@ -39,12 +39,20 @@
 $last_checked = get_transient( 'mailserver_last_checked' );
 
 if ( $last_checked ) {
-	wp_die( __( 'Slow down cowboy, no need to check for new mails so often!' ) );
+	wp_die(
+		sprintf(
+			// translators: %s human readable rate limit.
+			__( 'Email checks are rate limited to once every %s.' ),
+			human_time_diff( time() - WP_MAIL_INTERVAL, time() )
+		),
+		__( 'Slow down, no need to check for new mails so often!' ),
+		429
+	);
 }
 
 set_transient( 'mailserver_last_checked', true, WP_MAIL_INTERVAL );
 
-$time_difference = get_option( 'gmt_offset' ) * HOUR_IN_SECONDS;
+$time_difference = (int) ( (float) get_option( 'gmt_offset' ) * HOUR_IN_SECONDS );
 
 $phone_delim = '::';