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Received-SPF: fail (domain of xxx.com does NOT designate 58.52.40.8 as permitted sender) client-ip=58.52.40.8
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Received-SPF: fail (domain of xxx.com does NOT designate 58.52.40.8 as permitted sender) client-ip=58.52.40.8

Setting up spf records preventing mails entering spam

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.