I've just received an user rights change notification email from Echo, and the main link in it points to a relative URL /wiki/%D8%AE%D8%A7%D8%B5:%D9%88%D8%B5%D9%84%D8%A9_%D8%AF%D8%A7%D8%A6%D9%85%D8%A9/23718221 rather than an absolute one. The email is in Arabic (from ar.wikipedia.org).
The message on Special:Notifications and in the flyout also seems to have a broken link, in English as well as Arabic: