dns.resolveMx(hostname, callback)
hostname<string>callback<Function>err<Error>addresses对象数组
使用 DNS 协议解析 hostname 的邮件交换记录(MX 记录)。传递给 callback 函数的 addresses 参数将包含一个对象数组,每个对象包含 priority 和 exchange 属性(例如 [{priority: 10, exchange: 'mx.example.com'}, ...])。
【Uses the DNS protocol to resolve mail exchange records (MX records) for the
hostname. The addresses argument passed to the callback function will
contain an array of objects containing both a priority and exchange
property (e.g. [{priority: 10, exchange: 'mx.example.com'}, ...]).】