Hallo zusammen,
GELÖST,
es lag tatsächlichen an einem fehlenden SPF Eintrag im DNS.
Das ist die Antwortmail:
Diagnoseinformationen für Administratoren:
Generierender Server: XXX.local
akuigb@gmail.com
Requested
Remote Server returned '550 Requested action not taken: mailbox unavailable'
Ursprüngliche Nachrichtenköpfe:
Received: from XXX.local (192.168.XXX) by
XXX.local (192.168.XXX) with Microsoft SMTP Server
(version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id
15.1.2176.2; Wed, 20 Dec 2023 10:46:39 +0100
Received: from svex2016.vwaeksaar.local ([fe80::90b:61b3:97a7:e412]) by
XXX.local ([fe80::90b:61b3:97a7:e412%5]) with mapi id
15.01.2176.012; Wed, 20 Dec 2023 10:46:39 +0100
From: XXX.de>
To: "XXX@gmail.com" <XXX@gmail.com>
Subject: Test2 Posrtfach
Thread-Topic: Test2 Posrtfach
Thread-Index: AdozKWqK1/+/2rVkRRiv6NsRWQXHXQ==
Date: Wed, 20 Dec 2023 09:46:39 +0000
Message-ID: <592043970774454fb03f3ac530e782eb@XXX.de>
Accept-Language: de-DE, en-US
Content-Language: de-DE
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-originating-ip: [192.168.XXX]
x-c2processedorg: b9de7bd4-88e6-4598-bb6c-5456ba338a84
Content-Type: multipart/alternative;
boundary="_000_592043970774454fb03f3ac530e782ebXXX_"
MIME-Version: 1.0