Source: www.upguard.com
What is SPF filtering and how do I implement it? | UpGuardCategory: Microsoft, firewall
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An SPF record, or Sender Policy Framework record, is an email authentication method of specifying all of the servers permitted to send emails on your behalf. When an email supported by an SPF record is sent, the recipient's server checks whether the sender's IP address is authorized to send emails with the displayed domain name.
To understand how an SPF record is used, it's important to first understand the journey of an email from the sending server to receiving server.
An SPF record, or Sender Policy Framework record, is an email authentication method of specifying all of the servers permitted to send emails on your behalf. When an email supported by an SPF record is sent, the recipient's server checks whether the sender's IP address is authorized to send emails with the displayed domain name.
To understand how an SPF record is used, it's important to first understand the journey of an email from the sending server to receiving server.
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