DNS "A" query for a single dot

[Stephane Bortzmeyer]

On Tue, Mar 11, 2008 at 12:10:15AM -0400,
 Barry Margolin <barmar at alum.mit.edu> wrote 
 a message of 23 lines which said:

> I think there are a number of domains that have MX records pointing
> to the root, as a convention to prevent mail from being sent to the
> domain.

Also, 'A' is the default type for dig so it may be someone learning
dig and making mistakes.