I found the answer to my own question -- hope it helps the other people.

Here's a clip from "lynx /usr/share/doc/pine-4.44/config.html" :
=============================================================================
   disable-these-drivers
          This variable is a list of mail drivers which will be disabled.
          The  candidates  for  disabling  are listed below. There may be
          more  in the future if you compile Pine with a newer version of
          the c-client library.
          + mbox
          + mbx
          + mh
          + mmdf
          + mtx
          + mx
          + news
          + phile
          + tenex
          + unix
          The  mbox  driver enables the following behavior: if there is a
          file  called  mbox  in your home directory, and if that file is
          either  empty  or  in  Unix mailbox format, then every time you
          open  INBOX  the  mbox  driver will automatically transfer mail
          from  the  system  mail  spool directory into the mbox file and
          delete  it  from  the  spool directory. If you disable the mbox
          driver, this will not happen.
============================================================================


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