Comments
Just to add to this. It is part of the limitation that you can't create queries or filter from related tables such as attributes. So they have created a hack that manually finds returned records and applies them to a filter. This is part of a broader weakness in being able to elegantly handle what is technically called many-to-many relationships.
Just 2c. Please take the time to integrate this with the new email capability and start the process of linking that email to actual business entities and transactions so they can be easily accessed to truly understand communications. Until you do that its not really a CRM or a single small business tool.
I was importing 1099-MISC with multiple Boxes, 3, 4, 15 and 17 and it dropped every single amount into Box 3 only - in the past it never did this - always was able to map the box number to the field in the Integration this year I could not even see a place to map the box number (and we have it in the source file) - this is a huge problem!