I have a website that ends in .net. If I get the .com domain of that site is their anyway to have visitors forwarded to the .net and email@example.com forwarded to firstname.lastname@example.org?
For web hosting, you can create a Redirect, or a Mirror so .com sends users to the .net.http://wiki.dreamhost.com/Mirror_Domain
Not globally for mail. You'll have to create a mail alias/forwarder for each address.