i can imagine how liberating it must have been to send the letter 17 years ago, but isn't it even more liberating to come upon them now that you've processed what you were experiencing. good for you.
i sent a similar 3 page handwritten letter to my Nmother several years ago, before i had any inkling of NPD, and although i listed several serious grievances i had with her and restated my life atrocities in the letter, the main point of the letter was to tell her that i forgave her. she, not really the type to keep up with correspondence, even important, legal/financial documents, did read it and recently, maybe about 6 months ago, i was in her home and caught a glimpse of the envelope in which i sent the letter originally with the letter hanging out a bit. i've thought about it and thought maybe she put it in plain view for a reason. maybe to remind me of it and the painful period we were going through at that time, as if i could forget. or maybe i just unexpectedly caught her re-reading it's contents. whatever the reason, i'm so glad i wrote and sent that letter. my Nmom has little conscience and forgets every thing i've ever said that plays her in a negative light. but with that letter, which i'm floored still exists, she has that reminder of what REALLY has broken our relationship, a temporary break from the fantasy she's harboring that her 30 yr old D is a blubbering, dependent, petty, incompetent.
inspiring SF! i hope some of the others with unsent letters will send them and dump some of that Ncrap back into the laps of the perpetrators.
tif