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https://social.technet.microsoft.com/forums/exchange/en-US/0432cb86-1952-4b86-9fbd-f38b807d3c0d/a-nondelivery-report-with-a-status-code-of-446
Jan 22, 2010 · Please help I keep on getting this message on my exchange Server. "A non-delivery report with a status code of 4.4.6 was generated for recipient rfc822;[email protected] (Message-ID <[email protected]>).
https://community.spiceworks.com/how_to/939-ndr-non-delivery-receipts-codes-and-their-meanings
5.4.2 Bad connection. 5.4.3 Routing server failure. No available route. 5.4.4 Cannot find the next hop, check the Routing Group Connector. Perhaps you have Exchange servers in different Routing Groups, but no connector. 5.4.6 Tricky looping problem, a contact has …
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/non-delivery-reports-in-exchange-online
47 rows · The email you receive is a delivery status notification, also known as a DSN or bounce …
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_outlook-mso_win10-mso_o365b/email-non-delivery-reports-in-office-365/59737dd5-b0b6-45e5-a79f-905277454468
Apr 07, 2020 · When there's a problem delivering an email message, Office 365 sends a delivery status notification, also known as a bounce message, to the sender letting them know. The most common type of status notification is called a non-delivery report (NDR) and they tell you that a …
https://www.experts-exchange.com/questions/23415079/A-non-delivery-Report-with-a-status-code-of-5-7-0-5-4-0-5-0-0-5-7-6-4-7-1-5-3-0-5-6-0.html
Prior to getting off the blacklist, you will need to clean the infected system. An infected system, in this case is defined as a computer that has a mass mailing worm or a …
https://www.techopedia.com/definition/1695/non-delivery-report-ndr
A non-delivery report (NDR) is a report that is automatically generated by a mail server to inform the sender that their email message was not successfully delivered. The NDR comes in the form of an email from the sender's mail server and contains information on why the delivery was unsuccessful.
https://docs.microsoft.com/en-us/Exchange/mail-flow/non-delivery-reports-and-bounce-messages/non-delivery-reports-and-bounce-messages
24 rows · A key piece of information in this section is the enhanced status code (for example, 4.4.7). …
https://tools.ietf.org/html/rfc3463
RFC 3463 Enhanced Mail System Status Codes January 2003 X.3.XXX Mail System Status Mail system status indicates that something having to do with the destination system has caused this DSN. System issues are assumed to be under the general control of the destination system administrator. X.4.XXX Network and Routing Status The networking or routing codes report status about the delivery system ...Author: G. Vaudreuil
http://forums.msexchange.org/A_non-delivery_report_with_a_status_code_of_5%256%251/m_1800491348/tm.htm
Nov 06, 2008 · Posts: 445 Joined: 16.Sep.2008 Status: offline First check if the user for which NDR is generated is a valid user. Second if the user is not valid, you can ignore the events as what happens is Spammers randomly email like john.doe or jdoe or johnd etc @domain.com and when they do not receive ndr for a email address they update thei spam database and start spamming those addresses.
https://serverfault.com/questions/223780/exchange-2003-mail-non-delivery-ndr-spam-activity-events-7002-7004
A non-delivery report with a status code of 5.4.0 was generated for recipient rfc822;[email protected] (Message-ID ). Causes: This message indicates a DNS problem or an IP address configuration problem Solution: Check the DNS using nslookup or dnsq. Verify the IP address is in IPv4 literal format. Data:
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