I know very little about DNS configuration. Could anyone please explain to me, in plain english, what the following DNS configuration achieve? It's the default configuration for my hosting provider.
NAME/TYPE/VALUE/PRIORITY
A X.X.X.X 0
* A X.X.X.X 0
smtp A Y.Y.Y.Y 0
MX smtp 10
NS foo1.bar.com. 0
NS foo2.bar.com. 0
example.com. TXT v=spf1 a mx +all 0
A couple of crucial points:
- Why the DOTs at the end of the domains?
- Why the MX record has some priority set and why 10?
- What's the difference between the first two records?