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https://support.microsoft.com/en-us/help/256321/enhanced-status-codes-for-delivery-rfc-1893
Apr 19, 2018 · The codes space defined is intended to be extensible only by standards track documents. Mail system specific status codes should be mapped as close as possible to the standard status codes. Servers should send only defined, registered status codes. System specific errors and diagnostics should be carried by means other than status codes.
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://answers.microsoft.com/en-us/outlook_com/forum/oemail-osend/delivery-failure/d1a95bad-2124-4edf-a1f0-ea1808e1cf30
May 10, 2017 · This just started happening yesterday. I'm getting Delivery Status Notification (Failure) messages to known good email addresses I sent to in previous days. The following is the Diagnostic-Code to the last Delivery Status Notification (Failure): 5.7.1
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://www.lifewire.com/ignore-delivery-failures-of-unsent-messages-1174019
Nov 14, 2019 · Since email delivery usually works (or at least did before overzealous spam filters started blocking legitimate mail), success is not normally reported but failures are. If you have ever mistyped an email address I'm sure you know the often detailed, not always easy to parse but usually alarming "delivery failure" messages.Author: Heinz Tschabitscher
http://emailaddressmanager.com/tips/codes.html
The first digit gives the status of the email message: 2 means the email was succesfully sent ; 4 means there was a temporary problem while sending the email (your email server may try to send it again or you have to resend it, depending on your server settings).
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://www.ibm.com/support/knowledgecenter/en/SSWU4L/Mobile/imc_Mobile/Mobile_q_a_watson_assistant/SMS_delivery_status_codes_Karix_India.html
97 rows · View a list of delivery status codes from Karix (mGage India). In case of an SMS delivery …
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 · When there's a problem delivering an email message that you sent, Office 365 sends an …
https://www.techrepublic.com/forums/discussions/help-delivery-status-notification-failure/
HELP! - Delivery Status Notification (Failure) ... so does the codes below tell you if my bf set up his mailbox to refuse incoming mail or disabled his mailbox? I tried to remove complete email ...
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