Sep 18, 2026
邮件送达率实战：SPF、DKIM、DMARC 配置与退信排查
从事务邮件与 Newsletter 的送达链路出发，讲解 SPF、DKIM、DMARC 的正确配置与常见断裂原因、DMARC 分阶段收紧与聚合报告解读、自建与代发取舍，以及邮件进入垃圾箱后的排查顺序。
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