VERIFIED SOLUTION i
Portrait Dialogue 6.1.0 and upwards
The Litmus test function for Dialogues email marketing should work "out of the box".
If it is not working verify the /EmailTestingSupport parameter in Database Instances/General Admin/Channel parameters.
In this parameter you will find three options:
- No support = 0
- Simple spam = 1 (spam rating only)
- Advanced email testing = 2 (spam rating plus a message preview of how it would look on various email clients devices)
UPDATED: March 30, 2017