Hey, Has this been tested in 6.8? We have just taken the plunge and I cannot get the emails flowing.
As a side note on the attributes, do you need to mape the attributes into the content using the attributes table eg
"Attribute Name" User "Attribute Value" - %{Endpoint:Username} then in the content you can use %{User} to call the attribute.
That is theory on my side as i cannot get emails yet :)