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https://support.office.com/en-us/article/Sent-email-in-Outlook-com-comes-back-delivery-failed-45e048ac-f7b1-4c0f-b525-081cb34f1062
These terms are used when your message has been intentionally blocked by a spam or blacklist filter on the recipient's email server. The recipients server believes that the mail server or mail account that you're using is a source of spam.
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-550-5-7-1-in-exchange-online
In the Exchange admin center, click Mail Flow > Connectors. In the Outbound connectors section, select the connector that's used for hybrid, and choose Edit. Verify the following information: Delivery: If Route mail through smart hosts is selected, confirm the correct IP address or FQDN is specified.
https://docs.microsoft.com/en-us/Exchange/mail-flow/queues/message-intervals
The message expires after all delivery efforts have failed over a specified period of time. After a message expires, the sender is notified of the delivery failure, and the message is deleted from the queue. In all three cases of retry, resubmit, or expire, you can manually intervene before the automatic actions are performed on the messages.
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_outlook-mso_other-mso_2007/how-to-stop-mail-delivery-system-failure/4f5e3298-571e-4d43-a879-fa2dd53e864e
Apr 07, 2020 · Receiving non-delivery reports for messages you did not send is pretty much a fact of life in today's world. Spammers harvest addresses from all over the Internet and then send their junk using some of the addresses they've harvested. Apparently, your address is in that lot and is being used as the sending address for junk mail.
http://techgenix.com/troubleshooting-mail-flow-issues-exchange-server/
Mar 17, 2017 · In this case, the mail flow test failed, and the Exchange Remote Connectivity Analyzer was able to trace the cause to the message being blocked by Spamhaus. Figure D The Exchange Remote Connectivity Analyzer was able to determine the cause of the failed test.
https://support.microsoft.com/en-us/help/979174/454-4-7-0-temporary-authentication-failure-in-a-microsoft-exchange-ser
Feb 19, 2019 · 454 4.7.0 Temporary authentication failure in a Microsoft Exchange Server Content provided by Microsoft Applies to: Exchange Server 2019 Exchange Server 2016 Standard Edition Exchange Server 2016 Enterprise Edition Exchange Server 2013 Standard Edition Exchange Server 2013 Enterprise Exchange Server 2010 Standard Exchange Server 2010 Enterprise ...
https://practical365.com/exchange-server/exchange-server-protocol-logging/
Aug 10, 2012 · Configuring Protocol Logging on Transport Servers. The first is the per-server settings, configured on Hub Transport and Edge Transport servers for Exchange 2007/2010, or either Client Access or Mailbox servers in Exchange 2013. Protocol log paths can be set in the Exchange Management Console in the properties of the server.
https://community.spiceworks.com/topic/322444-delivery-has-failed-to-these-recipients-or-groups
Feb 17, 2017 · Delivery has failed to these recipients or groups: All Employees The e-mail address you entered couldn't be found. Please check the recipient's e-mail address and try to resend the message. If the problem continues, please contact your helpdesk. Diagnostic information for administrators: Generating server: EXCHANGE2010SVR.mydomain.l
https://support.microsoft.com/en-us/help/2685437/delivery-has-failed-and-550-5-1-1-resolver-adr-recipnotfound-ndr-after
Nov 21, 2019 · "Delivery has failed" and "550 5.1.1 RESOLVER.ADR.RecipNotFound" NDR after a mailbox is moved to Office 365 Content provided by Microsoft Applies to: Exchange Online Exchange Server 2013 Enterprise Exchange Server 2013 Standard Edition Exchange Server 2010 Enterprise Exchange Server 2010 Standard More
https://serverfault.com/questions/355862/exchange-reporting-about-any-delivery-failure
for Exchange 2000 and 2003 use the properties of your SMTP virtual server to set the mail address to receive copies of internal NDRs. From 2007 on you also could either use the Exchange Troubleshooting Assistant (integrated with the Exchange Management Console) to troubleshoot message delivery …
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