You are simply too kind. Look, do this, you'll get better results.
Next time you're near a building supply, or landscaping center -- anyplace that sells bricks -- buy a dozen. When these hose-heads send you their gimme letters, do your usual, but then use clear packing tape to securely affix the envelope to one of your bricks. Drop it in the Parcel bin at the Post Office and laugh all the way home.
This technique works with mail from political candidates you oppose, too. Use it in health. I guarantee satisfaction.
LOL!
Wouldn't it be something if everyone did that? "Help! I've been bricked!"