Everyone loves getting mail! Except for junk mail and bills. And why are those phone books still showing up on the porch? But other than that, everyone loves getting mail! So send your mom a note. Send your nephew a birthday card. And send a compliment to your favorite brand. Because unlike your deadbeat nephew, the company might actually send you some free stuff. But not all letters are created equal. Here are the elements you need to include to write an effective compliment or complaint letter to your favorite brand.