NSLOOKUP How to use nslookup to verify your DNS MX (mail exchanger) records. The following is an example you can use to review your own DNS settings. If a change has been made to your DNS entries, expect propagation to occur within the next 48 to 72 hours for the rest of the internet community to "know" that your settings have been changed. Most of the time, a mail delivery service issue is caused by incorrect DNS MX record settings. To verify that the DNS records are correct, follow the steps below:

Here we will be using onemail.com as an example.

1. Open your command prompt
2. At the command prompt type "nslookup". Press enter. It will display:

   Default Server: rock1.rockliffe.com (this would be your default DNS server)
   Address: 64.14.3.246

3. Next type the domain you are requesting such as onemail.com followed by a perioid (.) press enter.

   for example: onemail.com.

4. A display of DNS servers will appear.
5. Select and copy one of the DNS servers such as ns1.ofish.com or another is available or if primary fails.
6. server ns1.ofish.com

   This places you directly into the ns1.ofish.com DNS server. It will display:

   Default Server: ns1.ofish.com
   Address: 64.139.34.163

7. Next type "set type=mx". Press enter.
8. Next type the domain in question. In our example its onemail.com

   The display should be similar to the following:

   onemail.com preference = 20, mail exchanger = mail2.onemail.com
   onemail.com preference = 10, mail exchanger = mail.onemail.com
   onemail.com nameserver = ns1.ofish.com
   mail2.onemail.com internet address = 64.139.34.190
   mail.onemail.com internet address = 64.139.34.171
   ns1.ofish.com internet address = 64.139.34.163

   you are concerned only about the MX record settings for the mail to work. Look for the authoritative answer entry to have something similar to:

   onemail.com preference = 10, mail exchanger = mail.onemail.com