On Sat, 04 Oct 2014 13:59:54 +0200
Benny Pedersen <m...@junc.eu> wrote:

> On October 4, 2014 4:08:00 AM "David F. Skoll"
> <d...@roaringpenguin.com> wrote:

> > So it occurs to me that if
> > a mail comes in with a Return-Path: header that does not match
> > the envelope sender, that's another very suspicious sign.

> As this mail list here :)

Eh?

Here are headers from your message:

Return-Path:
 <users-return-105527-dfs=roaringpenguin....@spamassassin.apache.org>
Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by
 colo3.roaringpenguin.com (8.14.3/8.14.3/Debian-9.4) with SMTP id
 s94C75ki001614 for <d...@roaringpenguin.com>; Sat, 4 Oct 2014 08:07:13 -0400

And logs:

colo3:~$ fgrep s94C75ki001614 /var/log/mail.log|grep from=
Oct  4 08:07:13 colo3 sm-mta[1614]: s94C75ki001614: 
from=<users-return-105527-dfs=roaringpenguin....@spamassassin.apache.org>, 
size=2971, class=0, nrcpts=1, 
msgid=<148db07ca90.280b.d475fad7b14312f5d8424e35e39f7...@junc.eu>, proto=SMTP, 
daemon=MTA, relay=hermes.apache.org [140.211.11.3]

The envelope sender and Return-Path: header match.

Regards,

David.

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