[Exim] AUTH, the facts (I really need help :-))

Here is my setup for SMTP AUTH :

fixed_plain:
    driver = plaintext
    public_name = PLAIN
    server_condition = "${if eq
{${lookup{$2}lsearch{/usr/exim/conf/allowed_to_relay}{$value}}} {$3} {yes}
{no}}"
    server_set_id = $2

fixed_login:
driver = plaintext
public_name = LOGIN
server_condition = "${if eq
{${lookup{$1}lsearch{/usr/exim/conf/allowed_to_relay}{$value}}} {$2} {yes}
{no}}"
server_set_id = $1
server_prompts = "Username:: : Password::"

The facts are :

- It works well with Outlook Express 5.0 and Netscape (tested with releases
> 4.*)
- It doesn't work with Outllok Express 4.0, Outlook 98.

When people are trying to send messages with "not working programs", it
seems that exim doesn't send them anything, ans that they doesn't send
anything too. The mail is rejected, as people weren't using "authorisation"
...

Any idea ?

Here is a failed session log :

listening on port 25...
interface address = 195.101.94.250
host in rfc1413_hosts? yes (*)
sender_fullhost = [213.36.2.247]
sender_rcvhost = [213.36.2.247]
Process 8886 is handling incoming connection from [213.36.2.247]
host in host_lookup? no (option unset)
host in host_reject? no (option unset)
host in host_reject_recipients? no (option unset)
host in auth_hosts? no (option unset)
host in sender_unqualified_hosts? no (option unset)
host in receiver_unqualified_hosts? no (option unset)
host in helo_verify? no (option unset)
host in helo_accept_junk_hosts? no (option unset)
220 lebac.net ESMTP Exim 3.040 #4 Tue, 12 Oct 1999 22:21:19 +0200
set_process_info: 8886 3.040 handling incoming connection from
[213.36.2.247]
ready for new message
smtp_setup_msg entered
SMTP<< EHLO DESKTOP1
DESKTOP1 in local_domains? no (end of list)
sender_fullhost = (DESKTOP1) [213.36.2.247]
sender_rcvhost = [213.36.2.247] (helo=DESKTOP1)
set_process_info: 8886 3.040 handling incoming connection from (DESKTOP1)
[213.36.2.247]
250-lebac.net Hello DESKTOP1 [213.36.2.247]
250-SIZE
250-PIPELINING
250-AUTH PLAIN LOGIN
250 HELP
SMTP<< MAIL FROM: <olivier.arnould@???>
olivier.arnould@??? in sender_reject? no (option unset)
olivier.arnould@??? in sender_reject_recipients? no (option unset)
250 <olivier.arnould@???> is syntactically correct
SMTP<< RCPT TO: <judith.arnould@???>
iname.com in local_domains? no (end of list)
iname.com in relay_domains? no (end of list)
host in host_accept_relay? no (option unset)
550 relaying to <judith.arnould@???> prohibited by administrator
LOG: 1 MAIN REJECT
refused relay (host) to <judith.arnould@???> from
<olivier.arnould@???> H=(DESKTOP1) [213.36.2.247]
SMTP<< QUIT
221 lebac.net closing connection


Thank's for help, if you can :-)

Georges