From:  MAILER-DAEMON@grupovolpato.com (Mail Delivery System)
Date:  18 Dec 2018 09:38:24 Hong Kong Time
Newsgroup:  news.mozilla.org/mozilla.apis
Subject:  

Undelivered Mail Returned to Sender

NNTP-Posting-Host:  63.245.210.105

This is the mail system at host mail.grupovolpato.com.

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

: host lists.mozilla.org[63.245.210.105] said: 550
    5.7.1 : Recipient address rejected: Please see
    http://www.openspf.net/Why?s=mfrom;id=apis%40lists.mozilla.org;ip=189.2.93.227;r=mailman2.mail.mdc2.mozilla.com
    (in reply to RCPT TO command)