Understanding and Using SPF
SPF or Sender Policy Framework is a system created to prevent e-mail spam & e-mail spoofing. It does so by verifying the sender's IP address is a authorized one for the domain the mail is originating from. SPF requires domain admins to add DNS TXT or SPF records specifying hosts/IPs allowed to send mails for the domain. MX servers check with these records to identify spoof/spam mails.
SPF records are specially formatted text which can easily be parsed by mail exchange servers (MX servers), though there have been debates regarding the nature of TXT records which should be free text without any formatting, as a result a new record type SPF (DNS type 99) was created.
An example SPF record would look like this:
I would recommend everyone to create SPF records as this prevents email address spoofing. For further reading I would suggest you to visit http://www.openspf.org
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