[Octa-list] Undelivered Mail Returned to Sender

Mail Delivery System MAILER-DAEMON at xxxmail02.xyz
Thu Sep 26 04:47:05 UTC 2019

This is the mail system at host xxxmail02.xyz.

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
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                   The mail system

<octa-list at redhat.com>: host mx1.redhat.com[] said: 551 5.7.1 SPF
    fail: '[]'[], 'redhat.com'; REJECT (in reply to
    RCPT TO command)
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