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https://www.techrepublic.com/forums/discussions/help-delivery-status-notification-relay/
Delivery Status Notification (Relay) When one of our users sends an email outside of our system with a delivery status notification requested, they immediately receive a DSN containing their ...
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_outlook-mso_other-msoversion_other/track-emails-status-when-send-through-smtp-relay/dd09f77f-bf72-467d-a9b7-6c44a13032a7
Mar 19, 2020 · As far as I know, there is no other Office 365 API which used to trace the status of a message, especially for SMTP reply. If it's a regular mailbox, read receipts and delivery notification in Outlook client may meet your request. But if it isn't a regular mailbox, it's not allowed to configure your account in Outlook client.
https://www.mailenable.com/kb/content/article.asp?ID=ME020148
Mar 10, 2020 · You can view the SMTP outbound message queue with a summary description outlining why the delay occurred. Log files can be opened from within the MailEnable Administration program. Search the Activity log for the mail address of the sender who is receiving the Delivery Delay notification. This will identify where the message is actually attempting to be sent.
https://tools.ietf.org/html/rfc3461
The Delivery Status Notification service extension An SMTP client wishing to request a DSN for a message may issue the EHLO command to start an SMTP session, to determine if the server supports any of several service extensions.Author: K. Moore
http://forum.rebex.net/838/how-can-i-handle-delivery-status-notifications-dsns/
Dec 30, 2013 · There are several ways to request a receipt or Delivery Status Notification (DSN) to be send back to you: When an e-mail message can't be delivered, most SMTP servers send a Non-Delivery Report (NDR) to the sender.
https://www.ibm.com/support/knowledgecenter/en/ssw_ibm_i_72/cl/chgsmtpa.htm
Specify the SMTP address, in the format "[email protected]", that is used in the "from" field inside a delivery status notification. This should be a valid SMTP address. Up to 255 characters can be specified. The server will honor a request for Delivery Status Notification from a SMTP client. Status notes, indicating delivery, delay, relay or failure of a note to a recipient, will be generated as requested.
https://serverfault.com/questions/303966/smtp-error-goes-directly-to-badmail-directory-after-queue
The secret to SMTP is to check the logs. If this is the only situation of your mails failing, then you'll have to look to see if the mails are formatted correctly and if they're failing enmasse or just a portion.
https://thebackroomtech.com/2008/03/28/troubleshooting-exchange-error-447-delivery-delay-and-failures/
Right click on your SMTP Virtual Server – Properties – Delivery tab. I changed my Delay notification from 12 hours to 18 hours, and the Expiration timeout from 2 days to 4 days. You will need to tweak these settings to what is appropriate for your particular environment.Author: Aseem Kishore
https://serverfault.com/questions/65632/stop-delivery-status-notification-failure-messages-with-windows-2003-server-sm
The result is that the SMTP Service will send back to the listed "sender" a "Delivery Status Notification (Failure)" message, which contains the spam message.
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