Mail from own host is recognized as spam

[Catscrash]

Hi,

I have a problem with mail being marked as SPAM, although being
transmitted between virtual domains on the same hosts.

I checked my servers IP, it's not in any blacklist.

The X-Originating-IP is blacklisted, and I'm suspecting that that might
be the reason? But it shouldn't bother with it really, cause that's just
the DSL-IP of the sender, who used roundcube on the server.

Can you give me a tip what to do? Thanks!

Return-Path: <***@domain1.de>
Delivered-To: ***@domain2.de
Received: from localhost (HOSTNAME.local [127.0.0.1])
by HOSTNAME (Postfix) with ESMTP id 6A83D4210CF
for <***@domain2.de>; Mon, 15 Feb 2016 12:26:54 +0100 (CET)
X-Quarantine-ID: <jj4JEM7fe2eY>
X-Virus-Scanned: Debian amavisd-new at HOSTNAME
X-Spam-Flag: YES
X-Spam-Score: 6.476
X-Spam-Level: ******
X-Spam-Status: Yes, score=6.476 tagged_above=-999 required=6.31
tests=[RCVD_IN_BRBL_LASTEXT=1.644, RCVD_IN_PBL=3.558, RDNS_NONE=1.274]
autolearn=no autolearn_force=no
Received: from HOSTNAME ([EXTERNALIP])
by localhost (HOSTNAME [127.0.0.1]) (amavisd-new, port 10024)
with ESMTP id jj4JEM7fe2eY for <***@domain2>;
Mon, 15 Feb 2016 12:26:54 +0100 (CET)
Received: from HOSTNAME (HOSTNAME.local [127.0.0.1])
(Authenticated sender: ***@domain1.de)
by HOSTNAME (Postfix) with ESMTPA id DE72842091B
for <***@domain2.de>; Mon, 15 Feb 2016 12:26:53 +0100 (CET)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8;
format=flowed
Content-Transfer-Encoding: 8bit
Date: Mon, 15 Feb 2016 12:26:53 +0100
From: ***@domain1.de
To: ***@domain2
Subject: ***SPAM*** Fwd: Post
In-Reply-To: <000201d167e3$49f49d60$ddddd820$@xyz.de>
References: <000201d167e3$49f49d60$ddddd820$@xyz.de>
Message-ID: <***@domain1.de>
X-Sender: ***@domain1.de
User-Agent: Roundcube Webmail/1.1.4
X-Originating-IP: 80.xxx.yyy.zz

[@lbutlr]

Post by Catscrash
I have a problem with mail being marked as SPAM, although being
transmitted between virtual domains on the same hosts.

Why are you sending mail between local domains to amavis?

[Catscrash]

Post by @lbutlr

Post by Catscrash
I have a problem with mail being marked as SPAM, although being
transmitted between virtual domains on the same hosts.

Why are you sending mail between local domains to amavis?

ok, sure. Good Point. I added my own Domains to the whitelist, so as
long as no one starts faking them I'm good. Although if one has a really
large infrastructe, one might not trust every virtual domain on the host
and might want to have amavis check the mails anyway... so I still would
like to know why this happened...