Sender Policy Framework (SPF) is an email authentication method that allows checking whether the sending mail server is authorized to originate mail from the email sender's domain. This authentication only applies to the email sender listed in the "envelope from" field during the initial SMTP connection.
Sender Policy Framework (SPF) is an email authentication method that allows checking whether the sending mail server is authorized to originate mail from the email sender's domain. This authentication only applies to the email sender listed in the "envelope from" field during the initial SMTP connection.
Source: Wikipedia "Sender Policy Framework" · CC BY-SA 4.0
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