Update: Ich hab nun noch viele Tests durchgeführt. Seit der DNS Migration, ist es so das E-Mails die über den Proxmox Mailgateway von der Domäne foomail.cc schön brav von pv.at angenommen und auch zugestellt werden. Die Kommunikation funktioniert.
Bei der Mailcow hingegen werden die Mails zwar wie immer angenommen, aber nicht zugestellt. Stattdessen kommt die Meldung “too many hops”. Das passiert unabhängig von der Versenderdomäne, da gibt es hier ja einige.
Ich werde jetzt mal versuchen herauszufinden, wo denn der Unterschied zwischen den beiden Mailsystemen liegt. Sofern es überhaupt einen gibt.
Hier auch der Verlauf der Mail laut Header:
eceived: from cow.osit.cc ([172.22.1.253])
by d06c142b2a35 with LMTP
id 2MEpGSxhhWpKqgsAo2FxzQ
(envelope-from <>)
for <sendername@osit.cc>; Wed, 19 Aug 2026 09:54:20 +0200
X-Original-To: sendername@v-source.org
Received: from mail2.sozvers.at (mail2.sozvers.at [194.153.217.241])
(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
key-exchange x25519 server-signature RSA-PSS (4096 bits) server-digest SHA256)
(No client certificate requested)
by cow.osit.cc (Postcow) with ESMTPS id 7953940181
for <sendername@v-source.org>; Wed, 19 Aug 2026 09:54:19 +0200 (CEST)
Authentication-Results: cow.osit.cc;
dkim=none;
spf=none (cow.osit.cc: domain of mail2.sozvers.at has no SPF policy when checking 194.153.217.241) smtp.helo=mail2.sozvers.at;
dmarc=none
ARC-Authentication-Results: i=1;
cow.osit.cc;
dkim=none;
spf=none (cow.osit.cc: domain of mail2.sozvers.at has no SPF policy when checking 194.153.217.241) smtp.helo=mail2.sozvers.at;
dmarc=none
X-CSE-ConnectionGUID: MLdpF2akTp2XLlXU/MIuug==
X-CSE-MsgGUID: h6Ld6Ea6ROuRQz4YAZnMdA==
X-Amp-Result: SKIPPED(no attachment in message)
Received: from unknown (HELO acint-dc02-mailgw01.sozvers.at) ([194.153.217.236])
by mail2.sozvers.at with ESMTP/TLS/TLS_AES_256_GCM_SHA384; 19 Aug 2026 09:54:18 +0200
X-CSE-ConnectionGUID: EJZNwwNEScCjaGihCFtfhQ==
X-CSE-MsgGUID: o5/aQUK5Q1W8xl/ysBPwwA==
X-IronPort-AV: E=Sophos;i="6.25,231,1779141600";
d="scan'208,217";a="49999429"
Received: from unknown (HELO TE-PVA-01) ([172.17.29.102])
by acint-dc02-mailgw01.sozvers.at with ESMTP; 19 Aug 2026 09:54:18 +0200
Received: by TE-PVA-01 (Postfix)
id 4hPzNp1wWNz6ZF7Z; Wed, 19 Aug 2026 09:54:18 +0200 (CEST)
Date: Wed, 19 Aug 2026 09:54:18 +0200 (CEST)
From: MAILER-DAEMON@TE-PVA-01 (Mail Delivery System)
Subject: Undelivered Mail Returned to Sender
To: sendername@v-source.org
Auto-Submitted: auto-replied
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
boundary="4hPzNp1GVdz6ZF7P.1787126058/TE-PVA-01"
Message-Id: <4hPzNp1wWNz6ZF7Z@TE-PVA-01>
X-Last-TLS-Session-Version: TLSv1.3
X-Rspamd-Queue-Id: 7953940181
X-Spamd-Result: default: False [0.65 / 10.00];
MIME_FROM_MX_NONE(4.00)[te-pva-01];
BAYES_HAM(-2.86)[92.14%];
IP_REPUTATION_HAM(-1.39)[asn: 16099(-0.39), country: AT(-0.01), ip: 194.153.217.241(-0.99)];
BOUNCE_NO_AUTH(1.00)[];
MID_RHS_NOT_FQDN(0.50)[];
RCVD_IN_DNSWL_HI(-0.50)[194.153.217.241:from];
MIME_GOOD(-0.10)[text/plain,multipart/alternative];
RCVD_COUNT_THREE(0.00)[3];
RCPT_MAILCOW_DOMAIN(0.00)[v-source.org];
ARC_NA(0.00)[];
DMARC_NA(0.00)[te-pva-01];
RCPT_COUNT_ONE(0.00)[1];
RCVD_TLS_LAST(0.00)[];
R_SPF_NA(0.00)[no SPF record];
MIME_TRACE(0.00)[0:~,1:+,2:~,3:~,4:+,5:+,6:~];
R_DKIM_NA(0.00)[];
TO_DN_NONE(0.00)[];
TO_MATCH_ENVRCPT_ALL(0.00)[];
MID_RHS_MATCH_FROM(0.00)[];
FROM_NO_DN(0.00)[];
ASN(0.00)[asn:16099, ipnet:194.153.217.0/24, country:AT];
MISSING_XM_UA(0.00)[];
ARC_SIGNED(0.00)[v-source.org:s=dkim:i=1]
The mail system
<empfängername@pv.at>: too many hops
--4hPzNp1GVdz6ZF7P.1787126058/TE-PVA-01
Content-Description: Delivery report
Content-Type: message/delivery-status
Reporting-MTA: dns; TE-PVA-01
X-Postfix-Queue-ID: 4hPzNp1GVdz6ZF7P
X-Postfix-Sender: rfc822; sendername@v-source.org
Arrival-Date: Wed, 19 Aug 2026 08:44:08 +0200 (CEST)
Final-Recipient: rfc822; empfängername@pv.at
Original-Recipient: rfc822;empfängername@pv.at
Action: failed
Status: 5.4.0
Diagnostic-Code: X-Postfix; too many hops
--4hPzNp1GVdz6ZF7P.1787126058/TE-PVA-01
Content-Description: Undelivered Message
Content-Type: message/rfc822
Return-Path: <sendername@v-source.org>
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPzNp1GVdz6ZF7P; Wed, 19 Aug 2026 09:53:45 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPzMf35ndz6ZDlW; Wed, 19 Aug 2026 09:52:45 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPzLV0pTsz6ZDl6; Wed, 19 Aug 2026 09:51:45 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPzKM2Zc8z6ZDm4; Wed, 19 Aug 2026 09:50:45 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPzJB2DWQz6ZDlW; Wed, 19 Aug 2026 09:49:45 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPzH21PTnz6ZF7S; Wed, 19 Aug 2026 09:48:45 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPzFt2GzJz6ZF7d; Wed, 19 Aug 2026 09:47:44 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPzDk34Ggz6ZF7M; Wed, 19 Aug 2026 09:46:44 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPzCZ1G3qz6ZF71; Wed, 19 Aug 2026 09:45:44 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPzBQ41fPz6ZDm4; Wed, 19 Aug 2026 09:44:44 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPz9G1jLGz6ZDlL; Wed, 19 Aug 2026 09:43:44 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPz864nCNz6ZDl6; Wed, 19 Aug 2026 09:42:44 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPz6y1lYQz6ZDlW; Wed, 19 Aug 2026 09:41:44 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPz5p2HzDz6ZDm4; Wed, 19 Aug 2026 09:40:44 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPz4f3Gchz6ZDlm; Wed, 19 Aug 2026 09:39:44 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPz3V1JNpz6ZF6r; Wed, 19 Aug 2026 09:38:44 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPz2L3xLkz6ZDlW; Wed, 19 Aug 2026 09:37:43 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPz1B0y7Rz6ZDlT; Wed, 19 Aug 2026 09:36:43 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPz021RB3z6ZDlL; Wed, 19 Aug 2026 09:35:43 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPyyt4Dl9z6ZDl6; Wed, 19 Aug 2026 09:34:43 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPyxk1TTwz6ZDm4; Wed, 19 Aug 2026 09:33:43 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPywZ1GNFz6ZDlL; Wed, 19 Aug 2026 09:32:43 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPyvQ43zFz6ZDld; Wed, 19 Aug 2026 09:31:43 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPytG0r2lz6ZDlX; Wed, 19 Aug 2026 09:30:43 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPys733Qfz6ZDlL; Wed, 19 Aug 2026 09:29:43 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPyqy4PnVz6ZDld; Wed, 19 Aug 2026 09:28:42 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPypp1PfKz6ZDlL; Wed, 19 Aug 2026 09:27:42 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPynf2PxTz6ZDlx; Wed, 19 Aug 2026 09:26:42 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPymV1Lxtz6ZDlX; Wed, 19 Aug 2026 09:25:42 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPylL0tVKz6ZDlm; Wed, 19 Aug 2026 09:24:42 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPykB44qXz6ZDld; Wed, 19 Aug 2026 09:23:42 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPyj21R26z6ZDlT; Wed, 19 Aug 2026 09:22:42 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPygt0KYqz6ZDlp; Wed, 19 Aug 2026 09:21:42 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPyfk16Rvz6ZDlT; Wed, 19 Aug 2026 09:20:41 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPydZ01Xvz6ZDlc; Wed, 19 Aug 2026 09:19:41 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPycQ14t8z6ZDlL; Wed, 19 Aug 2026 09:18:41 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPybG3w62z6YVh5; Wed, 19 Aug 2026 09:17:41 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPyZ62lrxz6ZDlL; Wed, 19 Aug 2026 09:16:41 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPyXy00f6z6ZDlW; Wed, 19 Aug 2026 09:15:41 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPyWp10Zyz6ZDlL; Wed, 19 Aug 2026 09:14:41 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPyVf04Mlz6ZDlg; Wed, 19 Aug 2026 09:13:41 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPyTV19QFz6YVh5; Wed, 19 Aug 2026 09:12:41 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPySL39zWz6ZDlN; Wed, 19 Aug 2026 09:11:41 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPyRB0YlPz6ZDlW; Wed, 19 Aug 2026 09:10:40 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPyQ20VsWz6ZDl6; Wed, 19 Aug 2026 09:09:40 +0200 (CEST)
Received: by TE-PVA-01 (Postfix, from userid 1001)
id 4hPyNt10n9z6ZDlN; Wed, 19 Aug 2026 09:09:10 +0200 (CEST)
Received: from localhost (localhost [127.0.0.1])
by TE-PVA-01 (Postfix) with ESMTP id 4hPxqr1Dw6z6ZDlj
for <empfängername@pv.at>; Wed, 19 Aug 2026 08:44:08 +0200 (CEST)
X-MTA-CheckPoint: {6A8550B8-1-332810AC-3C6}
Received: from mail1.sozvers.at (unknown [172.18.33.1])
by TE-PVA-01 (Postfix) with ESMTP id 4hPxqq755pz6ZDlT
for <empfängername@pv.at>; Wed, 19 Aug 2026 08:44:07 +0200 (CEST)
X-CSE-ConnectionGUID: XMeRiOH+Txehec0QYtpCqw==
X-CSE-MsgGUID: 4ETMBAZVSCWMRY8klbmYhg==
Authentication-Results: mail1.sozvers.at; spf=Pass smtp.mailfrom=sendername@v-source.org
Received-SPF: Pass (mail1.sozvers.at: domain of
sendername@v-source.org designates 93.83.105.99 as
permitted sender) identity=mailfrom; client-ip=93.83.105.99;
receiver=mail1.sozvers.at;
envelope-from="sendername@v-source.org";
x-sender="sendername@v-source.org";
x-conformance=spf_only; x-record-type="v=spf1";
x-record-text="v=spf1 a mx -all"
X-ThreatScanner-Verdict: Negative
X-Talos-CUID: 9a23:+JfSQG9ER11wwNBoRVqVv34xF/okVV2e8GfdI0KzUV9YVKW+UEDFrQ==
X-Talos-MUID: 9a23:+6/QFQmQ/DJsfPgy+TRPdno+GftNyY2cNnsmrrA8ipmHMSZ1CjeS2WE=
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-AV: E=Sophos;i="6.25,231,1779141600";
d="scan'208,217";a="37330626"
X-Amp-Result: SKIPPED(no attachment in message)
X-MGA-submission: =?us-ascii?q?MDGytG3Lq8uK81rk5+hwQG7nEzqfOpvsZN+Gdq?=
=?us-ascii?q?dZm/71W/Q1DbFPDF770vTYvn+QBAVZ0Iwno/igbsfOHpFfzWkGS1kjlS?=
=?us-ascii?q?/u5BHlGTBpMefXNJstDP0hBKeDnq7CuwnZ/2mbqXyvxtr+8//Ng6H/NE?=
=?us-ascii?q?SA?=
Received: from cow.osit.cc ([93.83.105.99])
by mail1.sozvers.at with ESMTP/TLS/TLS_AES_256_GCM_SHA384; 19 Aug 2026 08:19:56 +0200
Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 45C4242DE2
for <empfängername@pv.at>; Wed, 19 Aug 2026 08:19:49 +0200 (CEST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=v-source.org;
s=dkim; t=1787120389; h=from:subject:date:message-id:to:mime-version:content-type:
content-transfer-encoding; bh=H7yiyBeREmHIHPTLmCX4G8QNHupG00rOdePqt8lsj8E=;
b=RTu2nkZHpeHDQi8zDW8Op9H8OdXb3ctQkcNS/EcT4D3euXJskUtm7yCf+MzQ9FGjZHH/14
5teMxJMUyK12MO9oWHn0iTrqhPimJyGLcoTj+iI9eeJfjPFAWVzN64v6zM/Xb8/7SQIG+G
YvIyhAGqNaOBuA13rH36KGDzGJrjSxW1pvla/nicI5w1eOJzi6UQarK4rFJk7Ido0XYNG9
NGzA0rhmv2vB51U4Q8fGPU4GMS/UFLeKZJ0BOq0TKyHD5xShxcACn4zyD96u/wYwH+uo8R
7onVQoKJVtzYlV98K5knW0LHDSrkSsFbijZuw84BQHgMbxmSjTclo49j3RIEGg==
Also das Mail scheint schon ziemlich im Kreis zu laufen…
