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"Love Through the Letterbox" is the tagline of Knickermail underwear greeting cards, a new company that sends sexy designer undies in the post instead of run-of-the-mill cards.

Each Knickermail underwear greeting card's shipment is accompanied by a gift card with your choice of 3 witty prewritten messages, or you can choose to include your own personal panty note. Check out some of the Knickermail underwear greeting cards options in the gallery.

Implications - Consumers will be drawn to products through which they are able express themselves to others in a humorous or lighthearted manner. Businesses that provide unconventional ways to express individuals' personalities or feelings will see large returns.