Provide a user created hash list for easy exclusion before getting to the Review Set.
In the review sets there are a ton of shell files that don't need to be there. It doesn't make sense to pay a reviewer to click on a twitter logo used in my organization, wait for the page to load, decide that it isn't relevant, mark it as such, and move on. Alternatively, have visually nested review sets. The email that may have relevance first, and then nested underneath that, all the contents/attachments/logos for quick exclusion.