DNS server encountered the obsolete record type %1 in database file %2, line %3. The record was ignored. MD or MF record ...

DNS server encountered the obsolete record type %1 in database file %2, line %3. 
The record was ignored. 
 
MD or MF record types are obsolete.  They should be converted to MX record type which has the format:   MX   
Example: 
	microsoft.com   MX 10 mai1.microsoft.com. 
 
For more information, see the "Resource records reference" in the online Help.