Undelivered Mail Returned to Sender

[Mail Delivery System]

This is the mail system at host clig88.secrel.com.br.

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

<palmeiras at setnet.com.br>: host 192.168.3.122[192.168.3.122] said: 550 5.1.1
    <palmeiras at setnet.com.br>: Recipient address rejected: User unknown in
    virtual mailbox table (in reply to RCPT TO command)
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From: <czdebian-l at debian.cz>
Subject: Aguardando confirma??o do pagamento.
Date: 10 Feb 2021 14:14:14 +0000
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URL: <http://www.debian.cz/pipermail/czdebian-l/attachments/20210210/cfd4c060/attachment.eml>