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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. On-Premise systems also allow these codes to be customized, ...
http://emailaddressmanager.com/tips/codes.html
X.7.1 Delivery not authorized, message refused X.7.2 Mailing list expansion prohibited X.7.3 Security conversion required but not possible X.7.4 Security features not supported X.7.5 Cryptographic failure X.7.6 Cryptographic algorithm not supported X.7.7 Message integrity failure
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/non-delivery-reports-in-exchange-online
Field Description; Generating server: This field indicates the name of the SMTP mail server that created the NDR. If no remote server is listed below the sender's email address, the generating server is also the server that rejected the original email message.
http://www.iana.org/assignments/smtp-enhanced-status-codes/smtp-enhanced-status-codes.xhtml
82 rows · Detail sub-codes may provide notification of transformations required for delivery. …
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://www.plivo.com/blog/introducing-sms-error-codes/
15 rows · Feb 16, 2017 · If there are any issues with your SMS delivery, some of our carriers alert us …
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://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?
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