I'm well aware of solutions like mail storm and all the other similar email cleaning solutions out there. These are SAAS tools with the free-trial then subscription-paid models that I'm not interested in. I'm more interested in a free or open-source tool even if a little complicated.
My current routine is to go through my emails, sort by unread find a bunch of unread ones that are sent by an advertiser, unsubscribe, then mass delete after filtering my inbox by this sender's email.
I am curious if someone made a lightweight simple tool that can filter emails by most received from X domain, or most repeated words in the subject and so on.