This program will take a domain name and return the MX records. MX records, or mail exchanger records, are DNS records that point to the mail server. For example, the MX server of https://www.devdungeon.com/ is mail.devdungeon.com. The net.LookupMX() function performs this lookup and returns a slice of the net.MX structs:
package mainimport ( "fmt" "log" "net" "os")func main() { if len(os.Args) != 2 { log.Fatal("No domain name argument provided") } arg := os.Args[1] fmt.Println("Looking up MX records for " + arg) mxRecords, err := net.LookupMX(arg) if err != nil { log.Fatal(err) } for _, mxRecord := range mxRecords { fmt.Printf("Host: %s\tPreference: %d\n", mxRecord.Host, mxRecord.Pref) }}
