On Fri, 2 Jul 1999, Richard Letts wrote: > for years bind allowed '_' in domain names. at one version they 'fixed' > this and thousands of zone files around the world had to be fixed. Who is > to say at some point in the future the server won't implement the > checking. > > I guess bind doesn't check for this because it would be quite an expensive > check to perform, given MX resords are cnames in a zone file don't have to > refer to other entries in the same zone file. you could end up by > performing a couple of thousand DNS queries every time a zone file were > loaded in order to check this. urgh my fault for posting as soon as I come home from work. the last paragraph should have read: Since MX OR CNAME RECORDS in a zone don't have to refer to other entries in the same zone: you might end up by performing a couple of thousand DNS queries every time a zone file were loaded in order to check this. I know CNAME!=MX records.
