[Exim] Pb with MX backup...

Hello.

I would configure a MX backup on a server wich run on exim 3.35 (it's
impossible today to upgrade).
For a domain, i have a MX with a priority of 0, a MX with a priority of 5 and
a MX with a priority of 10.
When i stop the primary mail server (priority 0), and send a mail to a user
who have a valide account on the mail server, the mail arrrive correctly on
the second MX (priority 5) but is sent immediatly to the MX with the priority
10...
The message in the exim/mainlog on the second mail server is:
<---
2004-05-28 09:29:36 1BTbo8-0000Vq-00 <= mikaod@??? H=smtp6.wanadoo.fr
(mwinf0603.wanadoo.fr) [193.252.22.25] P=esmtp S=736 id=40B6EA3D.1090
300@???
2004-05-28 09:29:37 1BTbo9-0000aA-00 <= mikaod@??? U=amavis P=scanned-ok
S=953 id=40B6EA3D.1090300@???
2004-05-28 09:29:37 1BTbo9-0000aA-00 my.domain.com [213.41.xxx.xxx]:
Connection refused
2004-05-28 09:29:38 1BTbo9-0000aA-00 => erick@??? R=lookuphost
T=remote_smtp H=mx2.nerim.net [62.4.16.80]
2004-05-28 09:29:38 1BTbo9-0000aA-00 Completed
2004-05-28 09:29:38 1BTbo8-0000Vq-00 => erick@??? R=vircheck
T=scanmails_remote
2004-05-28 09:29:38 1BTbo8-0000Vq-00 Completed
<---

I only add the line in the exim.conf:
relay_domains = my.domain.com


Somebody have an idee?..

Thanks for your help.

--
E.Bullier