reply to author VS. reply to list on this list.

[Sean McMahon]

Perhaps this is a windows specific problem, but when I reply to this list,
replies go to the list whereas on some lists, reply goes to the author and reply
to all goes to the list.  What makes one list differ in behavior from another in
the reply format?  Do those of you who primarily post email to this list from a
linux based mailer  encounter this situation when replying?