We are currently evaluating this issue and will update this article when we have more information.

In the meantime, 

1. Email AddressFinder@blackbaud.com before you submit your records. Provide your Site ID, Organization name and the information that you would like to be displayed in the From field on the 2: Opt Out Tab.
2. Submit your records, refer to How to create and submit an EmailFinder export and the request will be applied to your submission once it is received.