enabling Postfix DSN Support
Currently Tedomum email server does not enable Postfix or sendmail DSN Support as defined in email specification RFC 3464. Please note this is NOT return receipt. RFC 3464 is https://tools.ietf.org/html/rfc3464.
Without DSN, tedomum users are unable to see if emails we sent from tedomum have reached remote server such as gmail or not or if there is email server connection failure.
Postfix version 2.3 introduces support for Delivery Status Notifications as described in RFC 3464. The method to enable it is documented in website http://www.postfix.org/DSN_README.html
Almost all emails servers such as gmail Yahoo hotmail, red hat, debian, Ubuntu, IBM, Microsoft, HP, Dell, have enabled DSN in their organization or corporate email servers.