Go Lang MX record checker

EmailVerifier.go

package main

import (
	"bufio"
	"fmt"
	"log"
	"net"
	"os"
	"strings"
)

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	fmt.Println("Enter email address or type 0 to exit: ")
	for scanner.Scan() {
		checkDomain(scanner.Text()) //function to perform check domain
		fmt.Println("Enter email address or type 0 to exit: ")
	}

	if err := scanner.Err(); err != nil {
		log.Fatal(err)
	}

}

func checkDomain(domain string) {

	//exit if 0 is entered
	if domain == "0" || domain == "" {
		os.Exit(0)
	}

	var hasMX, hasSPF, hasDMARC bool
	var spfRecord, dmarcRecord string

	//check if domain has MX record
	mxRecords, err := net.LookupMX(domain)

	if err != nil {
		log.Println("No MX records found", err)

	}
	if len(mxRecords) > 0 {
		hasMX = true
	}

	//check if domain has SPF record
	txtRecords, err := net.LookupTXT(domain)

	if err != nil {
		log.Println("No TXT records found", err)
	}

	for _, record := range txtRecords {
		if strings.HasPrefix(record, "v=spf1") {
			hasSPF = true
			spfRecord = record
			break
		}
	}

	//check if domain has DMARC record

	dmarcRecords, err := net.LookupTXT("_dmarc." + domain)

	if err != nil {
		log.Println("No DMARC records found", err)
	}

	for _, record := range dmarcRecords {
		if strings.HasPrefix(record, "v=DMARC1") {
			hasDMARC = true
			dmarcRecord = record
			break
		}
	}

	//print results
	fmt.Println("Domain: ", domain)
	fmt.Println("Has MX records: ", hasMX)
	fmt.Println("Has SPF records: ", hasSPF)
	fmt.Println("SPF record: ", spfRecord)
	fmt.Println("Has DMARC records: ", hasDMARC)
	fmt.Println("DMARC record: ", dmarcRecord)
	fmt.Println("")

}