Microsoft Exchange 2010 451 4.4.0 DNS query failedhttps://i2.wp.com/windowstechblog.nl/wp-content/uploads/2015/02/Microsoft-Exchange-2010-451-4.4.0-DNS-query-failed-.png?fit=444%2C497&ssl=1https://i2.wp.com/windowstechblog.nl/wp-content/uploads/2015/02/Microsoft-Exchange-2010-451-4.4.0-DNS-query-failed-.png?resize=150%2C150&ssl=1Martien van Dijkit's all about Microsoft