SPF记录
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SPF（发件人策略框架）记录是一种[[txt-record|TXT记录]]，用于指定哪些邮件服务器有权代表域名发送电子邮件。SPF允许接收服务器验证发件人的合法性，从而防止电子邮件欺骗。
示例
The SPF record 'v=spf1 include:_spf.google.com ~all' means only Google's servers are authorized to send email for your domain.