At MailChimp, we manage over 65,000 subscriber lists, with over 75 million recipients in them. We’ve seen a sloppy list or two, and have dealt with a delivery problem or two. So we’ve learned a thing or two about how sloppy lists happen, and how to prevent them. Most sloppy lists come from ignorance, not evil. But that doesn’t make it any less stupid. So here are some stupid list management mistakes to avoid:

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