main.go

package main

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

func main(){
	scanner := bufio.NewScanner(os.Stdin)
	fmt.Printf("Domain, hasMX,hasSPF,sprRecord,hasDMARC,dmarcRecord\n")
	for scanner.Scan(){
		checkDomain(scanner.Text())
	}
	if err:= scanner.Err();err!=nil{
		log.Fatal("Error: Could not read from iunput %v\n",err)
	}


}

func checkDomain(domain string){

	var hasMX,hasSPF,hasDMARC bool
	var spfRecord,dmarcRecord string
	mxRecords,err := net.LookupMX(domain)
	
	if err!=nil{
		log.Printf("Error: %v\n",err)
	}

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

	txtRecords,err := net.LookupTXT(domain)
	if err!=nil{
		log.Printf("Error:%v\n",err)
	}

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

	dmarcRecords, err := net.LookupTXT("_dmarc."+domain)
	if err!=nil{
		log.Printf("Error%v\n",err)
	}

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

	fmt.Printf("%v,%v,%v,%v,%v,%v",domain,hasMX,hasSPF,spfRecord,hasDMARC,dmarcRecord)
}