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https://support.microsoft.com/en-us/help/256321/enhanced-status-codes-for-delivery-rfc-1893
Apr 19, 2018 · Request for Comments (RFC) 1893 provides an enhanced set of status codes for Delivery Status Notification (DSN) messages. This is an extension of the coding defined in RFC 821.
https://www.altn.com/NDR/
A Delivery Status Notification (DSN), 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. Errors can occur at multiple places in mail delivery.
https://docs.microsoft.com/en-us/Exchange/mail-flow/non-delivery-reports-and-bounce-messages/non-delivery-reports-and-bounce-messages
24 rows · The enhanced status code is returned by the server that generated the NDR (the source …
https://tools.ietf.org/html/rfc3463
There is a pressing need for a rich machine-readable, human language independent status code for use in delivery status notifications [ DSN ]. This document proposes a new set of status codes for this purpose. SMTP [ SMTP ] error codes have historically been used for reporting mail system errors.Author: G. Vaudreuil
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
Updates to a domain's DNS records can take up to 72 hours to propagate to all DNS servers on the Internet. If external senders (senders outside your organization) receive this NDR when they send message to recipients in your domain, try the following steps:
http://www.postfix.org/DSN_README.html
An envelope ID that is returned as part of delivery status notifications. This identifies the message submission transaction, and must not be confused with the message ID, which identifies the message content. The implementation of DSN support involves extra parameters to the SMTP MAIL FROM and RCPT TO commands,...
https://www.usps.org/info/smtp_status.html
This status code is returned when an SMTP client's IP address failed a reverse DNS validation check, contrary to local policy requirements. X.7.26 Multiple authentication checks failed - Code: 550 This status code is returned when a message failed more than one message authentication check, contrary to local policy requirements.
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_o365admin-mso_exchon-mso_o365b/create-a-new-custom-delivery-status-notification/df5eb8f4-3cec-4d33-9fb5-d0b1d29710c2
Mar 15, 2018 · create a new custom delivery status notification in exchange online I am trying to create transport rule with enhanced status code in exchange online.When i tried to enter the code "5.7.10 and click 'ok' in transport rule creation i am getting the message stating
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
This topic describes what you can do if you see error code 5.7.1 in a non-delivery report (also known as an NDR, bounce message, delivery status notification, or DSN). This information also applies to error codes 5.7.0 through 5.7.999.
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