system

<publishing@dagstuhl.de>: host b2761.mx.srv.dfn.de[194.95.235.53] said: 550
    5.7.1 Service unavailable; client [194.254.163.15] blocked using
    zen.spamhaus.org (in reply to RCPT TO command)

Étienne André
Université Sorbonne Paris Nord
https://lipn.univ-paris13.fr/~andre/

-------- Message transféré --------

Sujet :	Undelivered Mail Returned to Sender
Date :	Mon, 26 Jun 2023 11:15:40 +0200 (CEST)
De :	Mail Delivery System <MAILER-DAEMON@lipn.univ-paris13.fr>
Pour :	etienne.andre@lipn.univ-paris13.fr

This is the mail system at host mail.lipn.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

<publishing@dagstuhl.de>: host b2761.mx.srv.dfn.de[194.95.235.53] said: 550
5.7.1 Service unavailable; client [194.254.163.15] blocked using
zen.spamhaus.org (in reply to RCPT TO command)