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std/node/dns.ts>resolveMx

Deno standard library
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function resolveMx
import { resolveMx } from "https://deno.land/std@0.158.0/node/dns.ts";

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'}, ...]).

Parameters

hostname: string
callback: (err: ErrnoException | null, addresses: MxRecord[]) => void