Please refer to the Direct IG for Delivery Notifications specification.
That is a good place to start.
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Disposition-Notification-Options =
"Disposition-Notification-Options" ":"
disposition-notification-parameters
disposition-notification-parameters = parameter *(";" parameter)
parameter = attribute "=" importance "," value *("," value)
importance = "required" / "optional"However, if we can get a sample MIME mail with the options header then we can get more clarity.
Thanks
Return-Path: <doc...@direct.updoxqa.com> MIME-Version: 1.0 X-UserIsAuth: true Delivered-To: wellfo...@ttpds.sitenv.org Received: from 66.11.23.210 (EHLO udqa02.updoxnet.com) ([66.11.23.210]) by ip-172-31-38-177.us-west-2.compute.internal (JAMES SMTP Server ) with ESMTPA ID 498432681 for <wellfo...@ttpds.sitenv.org>; Tue, 26 Sep 2017 21:48:49 +0000 (UTC) Date: Tue, 26 Sep 2017 17:48:48 -0400 (EDT) From: doc...@direct.updoxqa.com To: wellfo...@ttpds.sitenv.org Message-ID: <840846304.563.1506462528113.JavaMail.mwitting@udqa02> Subject: Disposition Notification Options Header Content-Type: multipart/mixed; boundary="----=_Part_564_1237446685.1506462528114" Disposition-Notification-Options: X-DIRECT-FINAL-DESTINATION-DELIVERY=optional,true Disposition-Notification-To: doc...@direct.updoxqa.com ------=_Part_564_1237446685.1506462528114 Content-Type: multipart/alternative; boundary="----=_Part_565_1919130802.1506462528114" ------=_Part_565_1919130802.1506462528114 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Disposition Notification Options Header ------=_Part_565_1919130802.1506462528114-- ------=_Part_564_1237446685.1506462528114--
Hello,
Are you looking at the ‘Log’ or noticing the ‘Retry’ error status? The test will still fail when sent from a gmail account because the Disposition Notification Header Option is missing.

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