[bug-mailutils] [Error] fileinto: cannot save to mailbox: Function not implemented

[Kostas Zorbadelos]

Hello to the list.
This is my first post here as I am about to use mailutils in a new
project. My question has to do with libsieve. I am writing a program
that reads a mailbox (very similar to the one that exists in the
manual section 3.1, Framework) and foreach message it executes a sieve
script. 
The script I want to have executed is something like

require "fileinto";

if header :contains "from" "xxx"
 {
   fileinto "test.mbox";
 }

In my program I instanciate the sieve machine,

  /* Create the instance of the sieve machine */
  status = sieve_machine_init(&mach,NULL);
  if (status !=0) {
    mu_error ("Cannot initialize sieve machine: %s", mu_strerror (status));
    exit (EXIT_FAILURE);;
  }

  ...

Then I compile the script,
  ...
  status = sieve_compile(mach,argv[2]);
  if (status !=0) {
    mu_error ("Error compile sieve script: %s", mu_strerror (status));
    exit (EXIT_FAILURE);;
  }
  ...

and in a loop I execute the sieve script for each message using
    ...
    status = sieve_message(mach,msg);
    ...

The loop goes OK, printing the from and subject headers for each
message, but I get the string 

fileinto: cannot save to mailbox: Function not implemented

for each message that matches the script's criteria. Do I need to
register my own handler function for the fileinto action anywere? 
More generally, are there any default handlers for the fileinto,reject
and redirect actions?
Any help would be greatly appreciated, since I am missing something
and I didn't find anything obvious in the manual.
I am using GNU mailutils v.0.6.1-4 from the Debian Sarge.

Thanks in advance

Kostas

-- 
  Kostas Zorbadelos
  Systems Designer/Developer, Otenet SA 
  address@hidden contact: kzorba (at) otenet.gr
  
  Out there in the darkness, out there in the night
  out there in the starlight, one soul burns brighter
  than a thousand suns.