Undelivered Mail Returned to Sender

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I'm sorry to have to inform you that your message could not
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                   The mail system

<adi.attar@canonical.com> (expanded from <xh-translate@ubuntu.com>): User
    unknown in virtual alias table
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Un allegato non testuale è stato rimosso....
Nome:        non disponibile
Tipo:        text/rfc822-headers
Dimensione:  603 bytes
Descrizione: Undelivered Message Headers
URL:         <http://lists.linux.it/pipermail/tp/attachments/20111201/f10ff1c4/attachment.bin>