550 5.7.1 RESOLVER.RST.AuthRequired authentication required

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In this time we will share you about exchange 550 5.7.1 RESOLVER.RST.AuthRequired; authentication required. Do you know what is it? Actually the error 550 571 RESOLVER.RST AuthRequired authentication required is a very classic error. Either Exchange 2007 or 2010 have the ability to block access from outside to your distribution list. In a case, if your friend or someone sends a message so that person will receive a non-delivery report or NDR. That NDR has a copy of the message and the error with the error code 550. Exchange forwards email via the Send mail server which connect to the internet. The solution of the error 550 571 RESOLVER.RST AuthRequired authentication required is the setting of Preserve recipient address should to be disable by unchecking that configuration option and saving the change.

There are the configurations which can trigger the error 550 571 RESOLVER.RST AuthRequired authentication required.

–          Microsoft Exchange version 2010 DL (Distribution list) group that contains a single domain user account.

–          The Distribution List or DL group that has the Require that all senders are authenticated setting enabled under the Message Delivery Restriction configuration section on the Exchange server.

–          SMG configuration of “Preserve recipient addresses” is enabled. It is under Administration-Settings-> Directory Integration, in the “Directory Integration Settings” page, inside the “Address Resolution Options” configuration section.

–          Emails are originated from outside of the domain or external senders.

–          Destination e-mail address is the DL list and not the individual user.

By the way, have you ever got the error 550 571 RESOLVER.RST AuthRequired authentication required? It means that you are unable to get any email from the people. If you experience that problem maybe you will check your antispam logs, but actually that problem can be found in your Exchange server itself. So if you get the error 550 571 RESOLVER.RST AuthRequired authentication required quickly fit it by using the Exchange Management Console. Do you know how the methods to fix it? Well, if you do not know its step so you can see the following text. There are the methods to fix the error 550 571 RESOLVER.RST AuthRequired authentication required. Please follow the step correctly.

  1. The first thing which should you do is please click the Distribution Group name as you want to set.
  2. Then please click the “Properties“.
  3. After that click the “Mail Flow Settings” Tab.
  4. Please click the “Message Delivery Restrictions” item.
  5. Afterwards please click the “Properties” button.
  6. Then uncheck the “Require that all senders are authenticated” check-box.
  7. After that click “OK” button.
  8. Then click “OK” button again.
  9. Finally, you can solve the error 550 571 RESOLVER.RST AuthRequired authentication required.

In other case, there is the problem when the external users try to send email messages to mail-enabled public folders in Office 365 they receive a non-delivery report (NDR) that contains the error code. To solve that problem so you have to connect to Exchange Online by using remote PowerShell. And then please add permission for the Anonymous account to public folders.

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