plugin install

wp/wp-content/plugins/wp-mail-smtp/src/MailCatcherV6.php

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+<?php
+
+namespace WPMailSMTP;
+
+use PHPMailer\PHPMailer\Exception;
+
+/**
+ * Class MailCatcher replaces the \PHPMailer\PHPMailer\PHPMailer introduced in WP 5.5 and
+ * modifies the email sending logic. Thus, we can use other mailers API to do what we need, or stop emails completely.
+ *
+ * @since 2.2.0
+ */
+class MailCatcherV6 extends \PHPMailer\PHPMailer\PHPMailer implements MailCatcherInterface {
+
+	use MailCatcherTrait;
+
+	/**
+	 * Callback Action function name.
+	 *
+	 * The function that handles the result of the send email action.
+	 * It is called out by send() for each email sent.
+	 *
+	 * @since 2.2.0
+	 *
+	 * @var string
+	 */
+	public $action_function = '\WPMailSMTP\Processor::send_callback';
+
+	/**
+	 * Which validator to use by default when validating email addresses.
+	 * We are using built-in WordPress function `is_email` to validate the email address.
+	 *
+	 * @see PHPMailer::validateAddress()
+	 *
+	 * @since 3.6.0
+	 *
+	 * @var string|callable
+	 */
+	public static $validator = [ Processor::class, 'is_email_callback' ];
+
+	/**
+	 * Get the PHPMailer line ending.
+	 *
+	 * @since 2.2.0
+	 *
+	 * @return string
+	 */
+	public function get_line_ending() {
+
+		return static::$LE; // phpcs:ignore WordPress.NamingConventions.ValidVariableName.UsedPropertyNotSnakeCase
+	}
+
+	/**
+	 * Throw PHPMailer exception.
+	 *
+	 * @since 4.0.0
+	 *
+	 * @param string $error Error message.
+	 *
+	 * @throws Exception PHPMailer exception.
+	 */
+	protected function throw_exception( $error ) {
+
+		throw new Exception( $error );
+	}
+}