[DNSSEC-Ops] Undelivered Mail Returned to Sender

[Mail Delivery System]

This is the mail system at host racks.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

<dnssec-ops at afrinic.net>: host mx.afrinic.net[196.216.2.22] said: 550-Rejected
    because of sender violation policy on local server. Your host is 550 not
    allowed to send mail using OUR domain. (in reply to RCPT TO command)
-------------- next part --------------
An embedded message was scrubbed...
From: Mas Clientes<dnssec-ops at afrinic.net>
Subject: Directorio Empresarial 2019.
Date: 19 May 2019 16:38:02 -0500
Size: 37476
URL: <https://lists.afrinic.net/pipermail/dnssec-ops/attachments/20190519/db58053b/attachment-0001.mht>