Append special DNS database entries to the db.domain file In some rare cases it may be necessary to create special DNS database records that DNS Boss may not be able to handle. To do that, under the Advanced menu, select: "Append special DNS database entries to the db.domain file". Here is an example of the type of entry that could be added. topaz.testcompany.com. IN MX 100 garnet.testcompany.com. Keep in mind that this should only be done in rare cases.