This section of MH & nmh: Email for Users & Programmers is now the MH-E Manual. It's moved to http://mh-e.sourceforge.net/manual/.
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Several variables control what displayed messages look like. Normally
messages are delivered with a handful of uninteresting header fields.
You can make them go away by setting mh-clean-message-header to a
non-nil value. The header can then be cleaned up in two ways. By
default, the header fields in mh-invisible-headers are removed.
On the other hand, you could set mh-visible-headers to the fields
that you would like to see. If this variable is set,
mh-invisible-headers is ignored. I suggest that you not set
mh-visible-headers since if you use this variable, you might miss
a lot of header fields that you'd rather not miss. As an example of how
to set a string variable, mh-visible-headers can be set to show a
minimum set of header fields (see (section `Syntax of Regular Expressions' in The GNU Emacs Manual, for a description of the
special characters in this string):
(setq mh-visible-headers "^From: \\|^Subject: \\|^Date: ")
Normally mh-e takes care of displaying messages itself (rather than
calling an MH program to do the work). If you'd rather have mhl
display the message (within mh-e), set the variable mhl-formfile
to a non-nil value. You can set this variable either to t
to use the default format file or to a filename if you have your own
format file (mhl(1) tells you how to write one). When writing
your own format file, use a nonzero value for overflowoffset to
ensure the header is RFC 822 compliant and parsable by mh-e.
mhl is always used for printing and forwarding; in this case, the
value of mhl-formfile is consulted if it is a filename.
Two hooks can be used to control how messages are displayed. The first
hook, mh-show-mode-hook, is called early on in the process of
displaying of messages. It is used to perform some actions on the
contents of messages, such as highlighting the header fields. If you're
running Emacs 19 under the X Window System, the following example will
highlight the `From:' and `Subject:' header fields. This is a
very nice feature indeed.
Emphasize header fields in different fonts via mh-show-mode-hook
(defvar my-mh-keywords
'(("^From: \\(.*\\)" 1 'bold t)
("^Subject: \\(.*\\)" 1 'highlight t))
"mh-e additions for font-lock-keywords.")
(defun my-mh-show-mode-hook ()
"Hook to turn on and customize fonts."
(font-lock-add-keywords nil my-mh-keywords))
(add-hook 'mh-show-mode-hook 'my-mh-show-mode-hook))
The second hook, mh-show-hook, is the last thing called after
messages are displayed. It's used to affect the behavior of mh-e in
general or when mh-show-mode-hook is too early. For example, if
you wanted to keep mh-e in sync with MH, you could use
mh-show-hook as follows:
(add-hook 'mh-show-hook 'mh-update-sequences)
The function mh-update-sequences is documented in section Finishing Up. For those who like to modify their mode lines, use
mh-show-buffer-mode-line-buffer-id to modify the mode line in the
MH-Show buffers. Place the two escape strings `%s' and `%d',
which will display the folder name and the message number, respectively,
somewhere in the string in that order. The default value of
`"{show-%s} %d"' yields a mode line of
-----{show-+inbox} 4 (MH-Show)--Bot----------------------------------
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