MH & xmh: Email for Users & Programmers, 3rd Edition.pdf
Don’t be intimidated by the size of this book: You can use MH, xmh, exmh or mh-e right away by reading the quick-start tutorials. The rest of the book is here to help you do much more, but you don’t have to read it all!
You’ll use basic functions to send and receive mail, organize it, and do most of the basic things you’d do with MH. Along the way are some brief looks at advanced features that are covered in the next few chapters.
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MH & xmh: Email for Users & Programmers, 3rd Edition.pdf