Altra cosa..ora riesco a liberare la coda...ma l'email tornano indietro con scritto:

This is the Postfix program at host linuxserv.ufficio.

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 Postfix program

<ricevente@email.it>: host smtp.email.it[80.247.70.44] said: 553
<miamail@libero.it>: Sender address rejected: not owned by user
ricevente@email.it (in reply to RCPT TO command)