How to redirect links when moving from one domain to another?

We are changing servers. To accomplish this, we are using .net on the new server, whereas the current site is on .com. When all is moved over, I know I can simply redirect the .com domain. What I am trying to figure out, is how to make sure all our present posts, which have a .com link out there in cyberspace will redirect to a .net version of the post, to prevent 404’s.

Do you know if there a plugin that would be able to facilitate this?