"PING" Email Address

Open CMD For this example lets try GMAIL nslookup –type=mx gmail.com You will get something like this: gmail.com MX preference=30, exchanger = alt3.gmail-smtp-in.l.google.com gmail.com MX preference=20, exchanger = alt2.gmail-smtp-in.l.google.com gmail.com MX preference=5,  exchanger = gmail-smtp-in.l.google.