Mastering Go - Second Edition

Getting the MX records of a domain

Another very popular DNS request has to do with getting the MX records of a domain. The MX records specify the mail servers of a domain. The code for the MXrecords.go utility will perform this task with Go. The first part of the MXrecords.go utility is shown in the following Go code:

package main 
 
import ( 
    "fmt" 
    "net" 
    "os" 
) 
 
func main() { 
    arguments := os.Args 
    if len(arguments) == 1 { 
        fmt.Println("Need a domain name!") 
        return 
    } 

The second part of MXrecords.go contains the following Go code:

    domain := arguments[1] 
    MXs, err := net.LookupMX(domain) 
    if err != nil { 
        fmt.Println(err) 
        return 
    } 
 
    for _, MX := range MXs { 
        fmt.Println(MX.Host) 
    } 
} 

The code for MXrecords.go works in a similar way to the code for ...