[Mailman-Users] Local DNS vs. DNS on the same subnet

[Angel Gabriel]

I'm thinking of adding a DNS to my network, it currently doesn't have it,
some when mail outs go out they take a bit of time. What I would like to do,
is add a DNS server to the same subnet as mine, and have my DHCP server make
reference to it as the DNS server.

My question is, would it be quicker to have the DNS on the same machine as
mailman, I'm using Postfix by the way, *go postfix!*