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Baring that, I'd kill for a "ignore" or "filter" option. At least that way I can completely skip the crap and not waste the time and bytes downloading text I'm not going to read.
— KB4Hire
Actually, for anyone who is proficient in javascript it should be a breeze to write a Greasemonkey script that will filter out letters by author. I'd do it myself, but it's been years since I wrote any javascript and it would take me a while to get back up to speed and I just don't have the time right now. But it should be simply a matter of collecting the letters into an array and then deleting those on your ignore list before writing the array to the page.