J'ai deux mails rejetés, avec le même schéma : adresse à upn ou iutv, forwardée sur lipn, et
rejet par lipn (not access for bad user 2). 

Un paramètre modifié ? c'est difficile de savoir qui forwarde sur lipn dans les adresses que 
j'utilise !

François


Début du message réexpédié :

This is the mail system at host upn.univ-paris13.fr.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                  The mail system

<Mustapha.Lebbah@lipn.univ-paris13.fr> (expanded from
   <mustapha.lebbah@univ-paris13.fr>): host
   mail.lipn.univ-paris13.fr[194.254.163.24] said: 554 5.7.1
   <levy@lipn.univ-paris13.fr>: Sender address rejected: not access for bad
   user 2 (in reply to RCPT TO command)


!DSPAM:48,4bfcc992158236199586357!
Reporting-MTA: dns; upn.univ-paris13.fr
X-Mail-Server-Queue-ID: B9C831FA36D
X-Mail-Server-Sender: rfc822; levy@lipn.univ-paris13.fr
Arrival-Date: Wed, 26 May 2010 09:10:58 +0200 (CEST)

Final-Recipient: rfc822; Mustapha.Lebbah@lipn.univ-paris13.fr
Original-Recipient: rfc822;mustapha.lebbah@univ-paris13.fr
Action: failed
Status: 5.7.1
Remote-MTA: dns; mail.lipn.univ-paris13.fr
Diagnostic-Code: smtp; 554 5.7.1 <levy@lipn.univ-paris13.fr>: Sender address
   rejected: not access for bad user 2




Début du message réexpédié :

This is the Postfix program at host mail.iutv.univ-paris13.fr.


I'm sorry to have to inform you that your message could not be
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The Postfix program

<francoise.gayral@lipn.univ-paris13.fr> (expanded from
   <francoise.gayral@iutv.univ-paris13.fr>): host
   mail.lipn.univ-paris13.fr[194.254.163.24] said: 554 5.7.1
   <levy@lipn.univ-paris13.fr>: Sender address rejected: not access for bad
   user 2 (in reply to RCPT TO command)


!DSPAM:48,4bfcc9aa158231496418119!
Reporting-MTA: dns; mail.iutv.univ-paris13.fr
X-Postfix-Queue-ID: 1CC062507F8
X-Postfix-Sender: rfc822; levy@lipn.univ-paris13.fr
Arrival-Date: Wed, 26 May 2010 09:11:16 +0200 (CEST)

Final-Recipient: rfc822; francoise.gayral@lipn.univ-paris13.fr
Original-Recipient: rfc822; francoise.gayral@iutv.univ-paris13.fr
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; host mail.lipn.univ-paris13.fr[194.254.163.24]
   said: 554 5.7.1 <levy@lipn.univ-paris13.fr>: Sender address rejected: not
   access for bad user 2 (in reply to RCPT TO command)