On Fri, 31 Jul 2015 16:47:34 +0200 Reindl Harald wrote: > nevermind, envelope recipient, but that's also easy and contained in > the Received headers > > > Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) > by mail-gw.thelounge.net (THELOUNGE GATEWAY) with SMTP id > 3mjWRW6GLQz1l for <h.rei...@thelounge.net>; Fri, 31 Jul 2015 16:37:43 > +0200 (CEST)
It's usually there, but some servers never add it. There are also some mail systems where all mail has a recipient header like Delivered-To, even if received for multiple recipients.
