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Every e-mail marketer receives spam complaints. It doesn't matter if you use confirmed opt-in or have never seen a complaint in your life. Your messages do get complaints. Unless you use an e-mail service provider (ESP) or your ESP doesn't provide these services, you might not have immediate access to these complaints.
Spam complaints are a useful metric for two reasons. First, they indicate how closely you follow best practices. Second, ISPs and anti-spam services use them to filter and even to block messages. Click here to read the full article on ClickZ, and take a look at where complaints generate, how they're used, and what you can do to minimize them.
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