I'm not sure if I need to do anything else regarding email setup from my old host. Once I make the following change on my domain registration account (not dreamhost)
Does this change automatically allow dreamhost to start receiving my mail at @myhostname.com? or do I have to modify some MX email setting on my old host?
and if so, since it take a while for this name server change to happen, won't some of my email go to my original host during this change?