SPFレコードチェッカー

SPF(Sender Policy Framework) を実装するには、有効なSPFレコードが必要です。SPFレコードチェッカーは、SPFレコードを検証するためのツールです。

SPF (Sender Policy Framework) is an email-authentication technique used to prevent spammers from sending messages on behalf of your domain.
With SPF, an organization can publish authorized mail servers.
Together with DMARC, SPF helps the receiver (or receiving systems) determine how trustworthy the origin of an email is.

SPF, like DMARC, is an email authentication technique that uses DNS (Domain Name Service).
It allows you, as an email sender, to specify which email servers are permitted to send emails on behalf of your domain.