MX 优先级：数值越低，优先级别就越高。
邮件会先尝试发送到 MX 优先级为 5 的 mxbiz1.dnspod.cn。\n
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如果尝试失败，邮件会发送到 MX 优先级为 10 的 mxbiz2.dnspod.cn。\n
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MX 优先级说明