Subject: Undelivered Mail Returned to Sender

From: [email-masked] (Mail Delivery System)
Date: Wed, 3 Apr 2024 13:45:41 +0000 (UTC)

This is the mail system at host kappa.post.nuhet.se.

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

<[email-masked]>: host mx.pec.aruba.it[95.110.216.14] said: 554 5.7.1
    <[email-masked]>: Recipient address rejected: Messaggio rifiutato dal
    sistema. Indirizzo destinatario sconosciuto o non abilitato alla ricezione
    di posta non certificata. (in reply to RCPT TO command)