We have an exchange server and several web server applications. Yesterday we experienced some major outages with our DNS provider 1and1 on our domains. We were unable to receive emails due to MX records not found and also our users could not access our websites to access our web applications. All of these issues occurred due to our DNS provider being down or having major issues. Is there a way to have redundant DNS providers or services on the same domain? I am looking for failover or backup solution in case one DNS provider goes down. Does such a thing exist?