This third edition has been updated for X Release 6 and MH 6.8.3.
Other changes include:
How to use multimedia email with the MIME standard.
Three chapters, written by Brent Welch, about exmh.
Three chapters, by Bill Wohler, about mh-e.
The Reference Guide covers exmh and mh-e.
To make room for the new material, this edition doesn't include printed
manual pages.
If you don't have online manpages, there are now
directions for
obtaining them.
The shell programming chapter is much less tutorial and more specific to MH.
The old chapter describing shell programs is gone; the explanations have
moved to the chapters where the program would be most useful, and the
programming details are in Appendix D.
There are even more tips for using MH in real applications.