I have been running ISPConfig 2.2.6 for years. I have added a new domain and checked both the "DNS" and "DNS MX" boxes to host DNS for this domain and include a MX record. I have added a MX record via ISPConfig. The ISPConfig interface shows the MX record correctly, but when I use any other tool to check MX records the MX record is not appearing. dig mx mydomain.com answers with the SOA record instead of the MX record. What could be wrong?