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Sep 04, 2008 · A non-delivery report with a status code of 5.6.1 was generated for ... NDRs being generated - Status Code 5.6.1 - Event ID 3030: Ed Crowley [MVP] 9/4/08 11:19 PM: Two solutions I see to your problem: 1. The DNS server the Exchange server uses needs an MX record for those two
http://forums.msexchange.org/fb.aspx?m=1800491348
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://www.experts-exchange.com/questions/28232953/Exchange-2003-Event-ID-3030-Status-Code-of-5-6-1.html
A non-delivery report with a status code of 5.6.1 was generated for recipient rfc822;contractor@hisdomai n.com (Message-ID <5226F1B3.1010603@customer domain.eu>) The NDR is only occasionally generated with certain customers (always it seems with this particular customer) for the contractor's email address.
https://docs.microsoft.com/en-us/Exchange/mail-flow/non-delivery-reports-and-bounce-messages/non-delivery-reports-and-bounce-messages
24 rows · The message was rejected by a mail flow rule (also known as a transport rule). This …
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-5-4-6-through-5-4-20-in-exchange-online
554 5.4.6 Hop count exceeded - possible mail loop (always generated by on-premises Exchange Servers) 5.4.14 Hop count exceeded - possible mail loop ATTR34 (always generated by Exchange Online) Still need help? See also. Email non-delivery reports in Exchange Online. Related Articles
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://social.technet.microsoft.com/Forums/exchange/en-US/0a81fd19-e926-442c-aaa4-f1aece7c527c/a-non-delivery-report-with-a-status-code-of-500-530-535-540-and-570
Jun 17, 2013 · A non- delivery Report with a status code of 5.0.0, 5.3.0, 5.3.5, 5.4.0 and 5.7.0 Previous Versions of Exchange Exchange Previous Versions - Mail Flow and Secure Messaging
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 · Email non-delivery reports in Exchange Online. When there's a problem delivering an …
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-550-5-1-1-through-5-1-20-in-exchange-online
Their rule could have tried to send a copy of your message to a bad email address. If the recipient has such a rule, they'll need to correct the destination email address or remove the rule in order to prevent 5.1.x message delivery errors. Solution 4: Verify that your account hasn't been compromised. Did you send the original message at all?
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-550-5-1-10-in-exchange-online
Their rule could have tried to send a copy of your message to a bad email address. If the recipient has such a rule, they'll need to correct the destination email address or remove the rule in order to prevent 5.1.x message delivery errors. Office 365 supports multiple ways to forward messages automatically.
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