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Jul 17th, 2019
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  1. mpn.co. 86400 IN TXT "v=spf1 ip4:45.56.81.114 ip6:2600:3c01::f03c:91ff:fe84:5719 mx -all"
  2.  
  3. host mail.mpn.co[45.56.81.114] said: 550 5.7.1 <xxx@mpn.co>:
  4. Recipient address rejected: Message rejected due to: SPF fail - not
  5. authorized.
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