Users have problems getting OFF my lists

[Robin Sanders <sanders @ math . buffalostate . edu>]

I'm using majordomo on a RedHat 6.2 system to manage a 
small number of department lists.  My students and faculty 
members can subscribe and post to the lists without any 
problem. 

But everytime someone attempts to "unsubscribe" to a list, I
get the following error message bounced back to my account
(as the majordomo caretaker):

>
> MAJORDOMO ABORT (mj_majordomo)!!
>
> chown(851, 12, "/usr/local/majordomo-1.94.5/lists/mat164.new"): Operation not permitted
>

Any ideas on what this means?  This happens even when there is no
*.new or L.* file in my lists directory.

Any ideas on how to fix the problem?  

By the way, majordomo has UID 851 and the group "mail" has GID 12.

Thanks in advance for any help you can give me.

Robin Sue Sanders
Associate Professor and part-time sys adm

mail: Mathematics Department
      Buffalo State College
      1300 Elmwood Ave.
      Buffalo, NY 14222

email: sanders@math.buffalostate.edu

phone: (716) 878-6506