域名信誉
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域名信誉是电子邮件提供商、安全厂商和网络过滤服务基于历史和行为信号分配给域名的综合评分或分类，信号包括发送量、垃圾邮件投诉率、[[dmarc|DMARC]]/[[spf-record|SPF]]/[[dkim|DKIM]]对齐情况、域名年龄、注册模式、黑名单记录、网页内容类别以及与[[domain-abuse|滥用]]的关联。域名信誉低会导致邮件进入垃圾文件夹、通过安全网关时流量被拦截，并可能触发下架程序。信誉数据由Spamhaus、Cisco Talos、Google Safe Browsing和Barracuda等服务维护。新域名和流量突然激增的域名通常从低信誉起步，需要随时间积累信任。
示例
A newly registered .com domain begins sending bulk email; its lack of reputation history combined with high complaint rates causes Spamhaus to list it within days, causing all major email providers to block its messages.