Spam can be not only annoying but also dangerous to consumers. What that means for you as an email marketer is that the safety precautions that email service providers have put in place to control the amount of spam that makes it into a user's inbox may actually work against your perfectly legitimate and requested email to your subscribers. As you expand your email marketing program, you'll consistently be frustrated by having to fight your way past email spam filters. In this section, we'll take a closer look at what email spam is so that you understand why those filters are so very important.