how do you deal with threaded conversations and tracking the 1 liner replies to those mails? I only save that last copy in the same .txt file. I email it to my

how do you deal with threaded conversations and tracking the 1 liner replies to those mails? I only save that last copy in the same .txt file. I email it to myself, Ctrl-A, Ctrl-C, Ctrl-V, X-Delete.