We have collected information about Exchange Delivery Failure Codes for you. Follow the links to find out details on Exchange Delivery Failure Codes.
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 · Admins can learn about non-delivery reports (also known as NDRs or bounce messages) that are generated in Exchange Online. Email non-delivery reports in Exchange …
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
For example, the recipient might have been moved from an on-premises Exchange organization to Exchange Online, or vice-versa. Although the recipient's email address is the same, other internal identifiers for the recipient might have changed, thus breaking your cached entry for the recipient. Fix your Auto-Complete list entries in Outlook
https://support.office.com/en-us/article/Sent-email-in-Outlook-com-comes-back-delivery-failed-45e048ac-f7b1-4c0f-b525-081cb34f1062
Delivery failures, or emails that bounce or come back as undeliverable, can happen for several reasons. When you send an email and receive a delivery failure message, there could be several reasons.
https://help.socketlabs.com/docs/message-delivery-failure-codes
Message Delivery Failure Codes When messages bounce or fail in either the On-Demand service or in an On-Premise system, failure codes are provided in order to indicate the nature of the bounce or failure.
https://community.spiceworks.com/how_to/939-ndr-non-delivery-receipts-codes-and-their-meanings
For info, the 4.x.x codes indicate a 'Persistent Transient Failure', in which some temporary problem is preventing delivery. The 5.x.x codes indicate a 'Permanent Failure', in which the mail will not be delivered in its current form.
https://support.microsoft.com/en-us/help/256321/enhanced-status-codes-for-delivery-rfc-1893
Apr 19, 2018 · Enhanced Status Codes for Delivery - RFC 1893. Content provided by Microsoft. ... X.7.5 Cryptographic failure X.7.6 Cryptographic algorithm not supported X.7.7 Message integrity failure. The following is from RFC 1893: This document defines a new set of status codes to report mail system conditions. These status codes are intended to be used ...
https://www.iana.org/assignments/smtp-enhanced-status-codes/smtp-enhanced-status-codes.xhtml
82 rows · Simple Mail Transfer Protocol (SMTP) Enhanced Status Codes Registry Created 2008-05 …
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