[Mimedefang] allowing specific filenames?

[cam]

(please forgive if you get this twice, been screwing around with my       
sendmail configs and had an old one in place that wasn't doing masq)      
                                                                          
                                                                          
I've only recently installed mimedefang and spamassassin, so i'm not      
completely up to speed yet on all the options/configs.  i'm still digging 
through other people's posted scripts/filters so that i better understand 
the framework and functions.                                              
                                                                          
I have a few customers (of my isp) that need to receive specific files    
that can't be zipped on a regular basis (they are output from mortgage    
systems and mailed without human intervention).  I know the files will be 
in one of 2 file names/extensions.                                        
                                                                          
my question... has any tired (or have a snippet) of an allowed file name? 
i've seen several examples of the use of bad_file_name (or similar... mind
is fuzzy right now) and will be attempting to re-code this for my uses,   
but thought i would ask if anyone already had something like this in      
production.                                                               
                                                                          
Thanks for any responses.                                                 
Cam Proctor                                                               
bcp1 at craqskeep.com