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https://tools.ietf.org/html/rfc3463
RFC 3463 Enhanced Mail System Status Codes January 2003 1.Overview There is a need for a standard mechanism for the reporting of mail system errors richer than the limited set offered by SMTP and the system specific text descriptions sent in mail messages. There is a pressing need for a rich machine-readable, human language independent status code for use in delivery status notifications [].Author: G. Vaudreuil
https://en.wikipedia.org/wiki/Non_delivery_report
A bounce message or just "bounce" is an automated message from an email system, informing the sender of a previous message that message had not been delivered (or some other delivery problem occurred). The original message is said to have "bounced". More formal terms for bounce message include "Non-Delivery Report" or "Non-Delivery Receipt" (NDR), [Failed] "Delivery Status Notification" …
https://tools.ietf.org/html/rfc1891
RFC 1891 SMTP Delivery Status Notifications January 1996 5.Additional parameters for RCPT and MAIL commands The extended RCPT and MAIL commands are issued by a client when it wishes to request a DSN from the server, under certain conditions, for a particular recipient. The extended RCPT and MAIL commands are identical to the RCPT and MAIL commands defined in [], except that one or more of …Author: K. Moore
https://www.techopedia.com/definition/1695/non-delivery-report-ndr
Non-Delivery Report: 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. Most of the time this is ...
https://docs.microsoft.com/en-us/Exchange/mail-flow/non-delivery-reports-and-bounce-messages/non-delivery-reports-and-bounce-messages
For procedures related to NDRs in Exchange Server, see Procedures for DSNs and NDRs in Exchange Server. If you need help with NDRs in Office 365 or Exchange Online, see Email non-delivery reports in Office 365. Information in NDRs. This is an example of an NDR: The information in an NDR is separated into two sections:
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/non-delivery-reports-in-exchange-online
The most common type is called a non-delivery report (NDR) and they tell you that a message wasn't delivered. Non-delivery can be caused by something as simple as a typo in an email address. ... The message has more than 200 SMTP envelope recipients from the same domain. ... (HELO according to RFC 821) as the server it is trying to connect to ...
http://www.exchangeinbox.com/article.aspx?i=125
Understanding NDRs and other DSN types help us act on legitimate DSNs and discard spam. ... RFC 3461 - Simple Mail Transfer Protocol (SMTP) Service Extension for Delivery Status Notifications (DSNs) RFC 3462 - The Multipart/Report Content Type for …
https://support.microsoft.com/en-us/help/256321/enhanced-status-codes-for-delivery-rfc-1893
Apr 19, 2018 · This document defines a new set of status codes to report mail system conditions. These status codes are intended to be used for media and language independent status reporting.
https://enacademic.com/dic.nsf/enwiki/11629541
In the Internet's standard e-mail protocol SMTP, a bounce message, also called a Non-Delivery Report/Receipt (NDR), a (failed) Delivery Status Notification (DSN) message, a Non-Delivery Notification (NDN) or simply a bounce, is an automated electronic mail message from a mail system informing the sender of another message about a delivery problem.The original message is said to have bounced.
https://datatracker.ietf.org/doc/rfc1846/
SMTP 521 Reply Code (RFC 1846, September 1995) ... Abstract This memo defines a new Simple Mail Transfer Protocol (SMTP) [1] reply code, 521, which one may use to indicate that an Internet host does not accept incoming mail. 1. ... Return the mail with an appropriate non-delivery report. If an SMTP client encounters a 521 reply code in any ...
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