Several options exist, and I have tested a few. You know this OMG feeling, when you have several projects going on and receive 200 emails with hundreds of attachments within a few hours. It would be nice to find a solution to help me sort them out.
I used to download complicated threads containing many attachments to third-party apps and sort them there, however the integrations are not working at the moment at least here in Finland - due to changes Google made this year to their security policy.