0.238 * 0.000127 * 100 * 1700000 * 550 * 0.093 * 0.266 = 7000 So they assume 90.7% of messages get caught by spam filters. Apparently they send out around 1 b

0.238 * 0.000127 * 100 * 1700000 * 550 * 0.093 * 0.266 = 7000 So they assume 90.7% of messages get caught by spam filters. Apparently they send out around 1 billion emails, 23.8% of which gets delivered. Around 2600 people read the emails, and a quarter of them will an average of $100.