Definition

Unsolicited direct mail that everyone hates but somehow still works because occasionally human brains malfunction and respond to offers.

Example Usage

Our direct mail campaign had a 0.5% response rate, which is terrible but still profitable because CPM is basically free.

Origin

Pejorative term for direct mail, popularized in 1980s

Fun Fact

Despite being called 'junk,' direct mail ROI (3.5% average) outperforms email (2.6%) and other channels, probably because people have lower defenses against paper

Source: Direct mail marketing

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