自建邮局测试一直提示"Try it" URI, suspicious hostname

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请问有经验的大佬们，这个问题怎么解决？
mail-tester 只有这个地方扣分了：
-1.999 URI_TRY_3LD "Try it" URI, suspicious hostname

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自建邮局 测试一直提示"Try it" URI, suspicious hostname