We just recently added email accounts to our domain and the hoster provides cPanel Pro 1.0 (RC1) for configuring various email/filtering aspects. When I define an account level filter, ~/.cpanel/filter.yaml is created.
Concentrating on one thing one time can make you more successful. For presentation or review of your mind map, you may desire to display and contrast just parts of topics at the screen. Filter feature can help you to concentrate on a series of topics, sharing same markers or labels.
One of the nice things about Thunderbird (and for me, one of the most intensely irritating) is the ability to create filters by right-clicking the sender's email address and selecting Create Filter From...
The irritation comes from this: where is the filter stored?