CMailDomain::changePassword

static function changePassword($token, $domain, $login, $password, &$error)
{
	$result = CMailYandex::editUser($token, $login, array('domain' => $domain, 'password' => $password), $error);

	if ($result !== false)
	{
		return true;
	}
	else
	{
		$error = self::getErrorCode($error);
		return null;
	}
}