spf记录检查器

为了实现spf（发送方策略框架），您需要有一个有效的spf记录。SPF记录检查器提供SPF记录检查器来验证SPF记录。

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.