run letters through a tool that identifies topics / key words
keep track of how many times these topics/key words come up across the letter pool (this will eventually influence the order that tags get suggested in, and popular tags might long term get highlighted in some way, to serve as shortcuts)
attachment shows examples of what kind of thing im looking for... i'm open to something more specific and detailed than what is in the attachment, but it's also important to me to capture some of these general things, i.e. not just the ability to pull out the word "soccer" but also determine that it deserves the tag "sports"
once tags are generated, add them to the top of the letter preview cards