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function wp_site_admin_email_change_notification( $old_email, $new_email, $option_name ) {
	$send = true;

	// Don't send the notification to the default 'admin_email' value.
	if ( 'you@example.com' === $old_email ) {
		$send = false;
	}

	/**
	 * Filters whether to send the site admin email change notification email.
	 *
	 * @since 4.9.0
	 *
	 * @param bool   $send      Whether to send the email notification.
	 * @param string $old_email The old site admin email address.
	 * @param string $new_email The new site admin email address.
	 */
	$send = apply_filters( 'send_site_admin_email_change_email', $send, $old_email, $new_email );

	if ( ! $send ) {
		return;
	}

	/* translators: Do not translate OLD_EMAIL, NEW_EMAIL, SITENAME, SITEURL: those are placeholders. */
	$email_change_text = __(
		'Hi,

This notice confirms that the admin email address was changed on ###SITENAME###.

The new admin email address is ###NEW_EMAIL###.

This email has been sent to ###OLD_EMAIL###

Regards,
All at ###SITENAME###
###SITEURL###'
	);

	$email_change_email = array(
		'to'      => $old_email,
		/* translators: Site admin email change notification email subject. %s: Site title. */
		'subject' => __( '[%s] Admin Email Changed' ),
		'message' => $email_change_text,
		'headers' => '',
	);

	// Get site name.
	$site_name = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );

	/**
	 * Filters the contents of the email notification sent when the site admin email address is changed.
	 *
	 * @since 4.9.0
	 *
	 * @param array $email_change_email {
	 *     Used to build wp_mail().
	 *
	 *     @type string $to      The intended recipient.
	 *     @type string $subject The subject of the email.
	 *     @type string $message The content of the email.
	 *         The following strings have a special meaning and will get replaced dynamically:
	 *         - ###OLD_EMAIL### The old site admin email address.
	 *         - ###NEW_EMAIL### The new site admin email address.
	 *         - ###SITENAME###  The name of the site.
	 *         - ###SITEURL###   The URL to the site.
	 *     @type string $headers Headers.
	 * }
	 * @param string $old_email The old site admin email address.
	 * @param string $new_email The new site admin email address.
	 */
	$email_change_email = apply_filters( 'site_admin_email_change_email', $email_change_email, $old_email, $new_email );

	$email_change_email['message'] = str_replace( '###OLD_EMAIL###', $old_email, $email_change_email['message'] );
	$email_change_email['message'] = str_replace( '###NEW_EMAIL###', $new_email, $email_change_email['message'] );
	$email_change_email['message'] = str_replace( '###SITENAME###', $site_name, $email_change_email['message'] );
	$email_change_email['message'] = str_replace( '###SITEURL###', home_url(), $email_change_email['message'] );

	wp_mail(
		$email_change_email['to'],
		sprintf(
			$email_change_email['subject'],
			$site_name
		),
		$email_change_email['message'],
		$email_change_email['headers']
	);
}