To print a mail message, combine the mh show command and the lpr
command:

	show  message-number  |  lpr  -Pprinter

For example, to print message number 10 on the printer ajax:

	show  10  |  lpr  -Pajax

The printed file will be labeled with the filename stdin, which means
"standard input", which is the result of using a pipe.

If you want, you can print the files containing your messages directly.
The files are stored in the ~/Mail/inbox directory, by default.  So, if
you type:

	lpr  -Pajax  ~/Mail/inbox/1

your first mail message will be sent to the printer ajax.

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To print a mail message from the xmh mail program, you have to select
the printer before you start xmh.  From the athena% prompt, type:

	setenv PRINTER printername

where "printername" is the name of the printer you want to print to.  If
you are using an RS/6000 workstation, type:

	setenv LPRDEST printername

instead.  Then start xmh from the same window.  You can select a message
or range of messages, then use the Print command on the Message
pull-down menu, and the selected message or messages will be printed to
the printer.  There is no way to specify a printer from within xmh,
unfortunately.