[Exim] Transports and Directors

Can someone aid me effectivly write these two pieces(the transports and
the directors)

If someone sends email to jkezar@???
1) I want it to check to see if $HOME/.away exists. And if it does

  2) use this .away file as a filter.  The contents of $HOME/.away file
look like
    # Exim filter
    if personal then
      mail
      to $reply_address
      subject "Re: $h_subject"
      text "I am temporarily away"
    endif

and if the file does not exist exim continues to the next director.

Thanks!

--
Joseph Kezar