An SPF record is a public DNS txt entry that specifies the IP addresses that are allowed to send email on behalf of your domain. This is used by receiving mail servers to validate the envelope sender IP address is authorized to send mail from the domain for the purposes of email spoof prevention.
This article describes how to configure the SPF record checking to prevent spoofing of emails.
Note: This feature requires a subscription. It can be configured but cannot be enforced without a valid Email Protection subscription. The following sections are covered:
Applies to the following Sophos products and versions Sophos Firewall
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