Jun 10, 2014
Jun 10, 2014 Why Am I Getting a "Delivery Status Notification (Delay Jan 28, 2016 Delivery Status Notification (Delay) - Gmail Community
Delivery Status Notification (Failure) - Windows 7 Help Forums
Apr 22, 2020
Delivery Status Notification (Delay) - Gmail Community
Delivery-Status-Notification in sendmail 8.8 and later Getting a delivery-status-notification by using the return-receipt-to: header in sendmail 8.8.5. Delivery-Status-Notification in sendmail 8.8 and later header, it will treat it as if -Nsucess,delay,failure was given on the command line, or the equivalent DSN sequence was specified in the ESMTP dialog. Note: Email Delivery Codes - Error Codes 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).