There is an incompatibility between the packages enscript-1.6.1-9 and 
lpr-0.50-4 that ship with RedHat 6.2 regarding enscript's "-m" (send status
by mail) option.

This version of lpr expects its "-m" option to take an argument (the
address to mail the status report to). It does not work with an
argument-less "-m", unlike other lpr's (e.g. the Solaris lpr), that assume
mail should be sent to the user submitting the job.

Enscript expects lpr to accept an argument-less "-m", so if the enscript
user specifies that option, enscript just appends "-m" to the print
spooler's options.  This causes lpr to return an error: "lpr: missing
argument for 'm'".

I am not certain what the proper fix should be: should the enscript
interface be kept the same, allowing only the argument-less version (and
sending lpr the username of the person running the program); should
enscript users be forced to specify the recipient, keeping the interface
consistent with lpr; or should the argument be optional, 
sending to the person specified or the username if the argument was left
blank.  

In any case, it is a very easy fix involving only 5 lines of code.  (I will
send you my version, if you are interested.  It uses an optional argument.)

Hope this was descriptive enough.

Dan