Brush up on your envelope etiquette before sending a letter, postcard or invitation in the mail. Shop the Hottest Prime Day Deals Right Now: Tarte, Shark, Color Wow and More IE 11 is not supported.

Heal the Planet reported that 33% of all mail delivered worldwide is classified as junk mail. What to do with plastic-windowed envelopes and junk mail — and how to stop it all from clogging your ...