Readying multimedia messages for sending
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If you wish to pass additional arguments to `mhn' to affect how it
builds your message, use the variable `mh-mhn-args'. For example, you
can build a consistency check into the message by setting `mh-mhn-args'
to `-check'. The recipient of your message can then run `mhn -check'
on the message--`mhn' will complain if the message has been corrupted
on the way. The `C-c C-e' (`mh-mhn-edit') command only consults this
variable when given a prefix argument.