dnsPromises.resolveMx(hostname)

• hostname <string>

使用 DNS 协议解析 hostname 的邮件交换记录（MX 记录）。成功时，Promise 会被解析为包含对象数组，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. On success, the Promise is resolved with an array of objects containing both a priority and exchange property (e.g. [{priority: 10, exchange: 'mx.example.com'}, ...]).】