Bryan Costales wrote the very successful "sendmail" (bat book) for O'Reilly Media. His most recent credits are short stories published in The Banyon Review, Romance Magazine, the Riptide Journal, and Gold Dust Magazine. Bryan lives in Eugene, Oregon where he dabbles in photography.
This book has an excellent overview of UUCP and of MH; if you want to know these technologies, this is an excellent book. It also covers Elm, Usenet, rn, vn, mush, cu, tip, and more.
If you want to know about these topics, you need this book.