RFC2821 (http://ftp://ftp.rfc-editor.org/in-notes/rfc2821.txt):
When forwarding a message into or out of the Internet environment, a
gateway MUST prepend (http://dict.leo.org/ende?lp=ende&p=1zNBk.&search=prepend) a Received: line, but it MUST NOT alter in any
way a Received: line that is already in the header.
Die "unterste" Received-Zeile sollte demnach die "Erste" sein:
Received: from [IP-Adresse] by mail.webpage.t-com.de InterMail
with ESMTP
id <20081124090113.CEND2101372.fepb01-svc.webpage.t-com.de@Firmenname.local>
for <Empfängeradresse>; Mon, 24 Nov 2008 10:01:13 +0100