diff -r 48c4eec2b7e6 -r 8c2e4d02f4ef wp/wp-includes/class-wp-phpmailer.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/class-wp-phpmailer.php	Fri Sep 05 18:52:52 2025 +0200
@@ -0,0 +1,93 @@
+<?php
+/**
+ * WordPress PHPMailer class.
+ *
+ * @package WordPress
+ * @since 6.8.0
+ */
+
+/**
+ * WordPress PHPMailer class.
+ *
+ * Overrides the internationalization method in order to use WordPress' instead.
+ *
+ * @since 6.8.0
+ */
+class WP_PHPMailer extends PHPMailer\PHPMailer\PHPMailer {
+
+	/**
+	 * Constructor.
+	 *
+	 * @since 6.8.0
+	 *
+	 * @param bool $exceptions Optional. Whether to throw exceptions for errors. Default false.
+	 */
+	public function __construct( $exceptions = false ) {
+		parent::__construct( $exceptions );
+		$this->SetLanguage();
+	}
+
+	/**
+	 * Defines the error messages using WordPress' internationalization method.
+	 *
+	 * @since 6.8.0
+	 *
+	 * @return true Always returns true.
+	 */
+	public function SetLanguage( $langcode = 'en', $lang_path = '' ) {
+		$error_strings  = array(
+			'authenticate'         => __( 'SMTP Error: Could not authenticate.' ),
+			'buggy_php'            => sprintf(
+				/* translators: 1: mail.add_x_header. 2: php.ini */
+				__(
+					'Your version of PHP is affected by a bug that may result in corrupted messages. To fix it, switch to sending using SMTP, disable the %1$s option in your %2$s, or switch to MacOS or Linux, or upgrade your PHP version.'
+				),
+				'mail.add_x_header',
+				'php.ini'
+			),
+			'connect_host'         => __( 'SMTP Error: Could not connect to SMTP host.' ),
+			'data_not_accepted'    => __( 'SMTP Error: data not accepted.' ),
+			'empty_message'        => __( 'Message body empty' ),
+			/* translators: There is a space after the colon. */
+			'encoding'             => __( 'Unknown encoding: ' ),
+			/* translators: There is a space after the colon. */
+			'execute'              => __( 'Could not execute: ' ),
+			/* translators: There is a space after the colon. */
+			'extension_missing'    => __( 'Extension missing: ' ),
+			/* translators: There is a space after the colon. */
+			'file_access'          => __( 'Could not access file: ' ),
+			/* translators: There is a space after the colon. */
+			'file_open'            => __( 'File Error: Could not open file: ' ),
+			/* translators: There is a space after the colon. */
+			'from_failed'          => __( 'The following From address failed: ' ),
+			'instantiate'          => __( 'Could not instantiate mail function.' ),
+			/* translators: There is a space after the colon. */
+			'invalid_address'      => __( 'Invalid address: ' ),
+			'invalid_header'       => __( 'Invalid header name or value' ),
+			/* translators: There is a space after the colon. */
+			'invalid_hostentry'    => __( 'Invalid hostentry: ' ),
+			/* translators: There is a space after the colon. */
+			'invalid_host'         => __( 'Invalid host: ' ),
+			/* translators: There is a space at the beginning. */
+			'mailer_not_supported' => __( ' mailer is not supported.' ),
+			'provide_address'      => __( 'You must provide at least one recipient email address.' ),
+			/* translators: There is a space after the colon. */
+			'recipients_failed'    => __( 'SMTP Error: The following recipients failed: ' ),
+			/* translators: There is a space after the colon. */
+			'signing'              => __( 'Signing Error: ' ),
+			/* translators: There is a space after the colon. */
+			'smtp_code'            => __( 'SMTP code: ' ),
+			/* translators: There is a space after the colon. */
+			'smtp_code_ex'         => __( 'Additional SMTP info: ' ),
+			'smtp_connect_failed'  => __( 'SMTP connect() failed.' ),
+			/* translators: There is a space after the colon. */
+			'smtp_detail'          => __( 'Detail: ' ),
+			/* translators: There is a space after the colon. */
+			'smtp_error'           => __( 'SMTP server error: ' ),
+			/* translators: There is a space after the colon. */
+			'variable_set'         => __( 'Cannot set or reset variable: ' ),
+		);
+		$this->language = $error_strings;
+		return true;
+	}
+}