Hi I am using authsmtp as my outgoing smart host for my Exchange 2013, all works just great, however when a user-John Smith (john@xyz.com) try to reply to a "Read Receipt" from external
source an error appears in the exchange Delivery Report and AUTHSMTP Error logs:
Error : The Header From: address JohnSmith@xyz.com not authorised - please go to:http://control.authsmtp.com
Background Information:
- Single Server running AD/DNS and Exchange 2013 Server
- ESET Antivirus for Exchange (SPAM Manager Turned Off)
- AUTHSMTP checked and found no issues on their side
- Request "A delivery Receipt" works ok, but request "Read Receipt" is the problem
- All users have the same issue.
- Email address policy is set to default (Alais@xyz.com), but notice in the error it combinesfirstnameLastname@xyz.com.
Can anyone help? Many thanks in advance