Probleme mail delevery systeme

Bonjour,
dans "assistance orange" je n'ai pas trouvé la solution ni sur le site :

This is the mail system at host mwinf1e01.orange.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

<photo@bergers-cathares.com>: host spam1.ipt.fr[91.121.112.173] said: 550 5.1.1
<photo@bergers-cathares.com>: Recipient address rejected: User unknown in
relay recipient table (in reply to RCPT TO command)

voilà le message que je reçois parfois avec certaines adresses , j'ai changé mon adresse wanadoo en orange .fr .

je vous remercie d'avance pour vos reponses !