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In my fourth week, my email was not verified after sending it to 1,612 users. After a week, that number increased to 1,663 and my email was verified. Since then, I noticed that as my email is being verified, the number continued to decline in the following weeks to 1579, 1495, 1387, 1286, 1261, 1208, 1163, 1121, 1061, 1031, 1025, 1008, and 992. My wild guess is that once our email is not verified, then the number will increase again. I think this is another way of saying that if we want to have a fixed number of receivers, then we must upgrade our accounts.