Newsletter Relay auf externem Mailserver schlägt fehl. Status code: 550 5.0.350

Folgendes Problem: Wir versenden einen Newsletter per Mailingliste - @verpackung-haba.eu - also von unserer Hauptdomain mit O365 zu der Verteilerliste. Seit der Umstellung geht das aber nicht mehr mit unten stehender Fehlermeldung. (550 5.0.350 Remote server returned an error -> 550 delivery denied: no valid recipient or authentication missing) nun behauptet der Provder der Liste es läge an Office365 und er könne da nichts ändern.


Ist dem so? Muss ich hier in meinem O365 Exchange etwas umstellen?




Your message to ...@verpackung-haba.eu couldn't be delivered.
When Office 365 tried to send your message, the receiving email server outside Office 365 reported an error.
User. . . Office 365 newsletter
Sender Action Required

Policy violation or system error

How to Fix It
Check the "Reported Error" from the "Error Details" section shown below for more information about the problem. The error might tell you what went wrong and how to fix it. For example, if the error states that the message was blocked due to a potential virus or because the message was too large, try sending the message again without attachments.
If you're not able to fix the problem, it's likely that only the recipient's email admin can fix it. Contact the recipient by some other means (by phone, for example) and ask them to tell their email admin about the problem. Give them the "Reported Error" from the "Error Details" section below.

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More Info for Email Admins
Status code: 550 5.0.350

The error reported by the receiving server wasn't specific enough to determine the exact nature of the problem. These errors often indicate the message violates a security or policy setting configured on the recipient's email servers.

If the sender is unable to fix the problem by modifying their message, then it's likely a problem that only the recipient's email admin can fix. Try the following:

Check the error for information about the problem - The "Reported Error" returned by the external email server can be found in the "Error Details" section below. This error might tell you what went wrong and provide clues for how to fix it. For example, if the error states the message was rejected due a Sender Policy Framework (SPF) issue, then you'll have to work with your domain registrar to correctly configure your domain's SPF records.

Check the error for information about where the problem is happening - For example, look for a domain name like contoso.com. A domain name in the error might suggest who is responsible for the error. It could be the recipient's email server, or it could be a third-party service that your organization or the recipient's organization is using to process or filter email messages.

If you can't fix the problem, contact the responsible party's email admin - Give them the error code and error message from this non-delivery report (NDR) to help them troubleshoot the issue. For security or policy violation issues, it might be sufficient for them to just add your sending IP addresses or domain to their allowed senders list.

It's likely that only the recipient's email admin can fix the problem. Unfortunately, it's unlikely Office 365 Support will be able to help with these kinds of externally reported errors.
Original Message Details
Created Date: 10/31/2018 8:58:10 AM
Sender Address: *** Die E-Mail-Adresse wurde aus Datenschutzgründen entfernt. ***
Recipient Address: ...@verpackung-haba.eu
Subject: Verpackungs-Newsletter 153 - Oktober 2018

Error Details
Reported error: 550 5.0.350 Remote server returned an error -> 550 delivery denied: no valid recipient or authentication missing
DSN generated by: AM0PR05MB4371.eurprd05.prod.outlook.com
Remote server: server880-han.de-nserver.de



Message Hops
HOP TIME (UTC) FROM TO WITH RELAY TIME
1 10/31/2018
8:58:10 AM AM0PR05MB5140.eurprd05.prod.outlook.com AM0PR05MB5140.eurprd05.prod.outlook.com mapi *
2 10/31/2018
8:58:10 AM AM0PR05MB5140.eurprd05.prod.outlook.com AM0PR05MB4371.eurprd05.prod.outlook.com Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) *


Danke euch.