“Over the past five years, email marketing has become a powerful force in many industries’ marketing mixes.” E-mail marketing strategy is still a useful tool for marketers. Marketers use email to send advertisement direct to consumers. Compare to the actual ads mail, email is cheaper, faster, and more effective. Also it is easy to respond to the customers by using email for marketers to remain relation with consumers. Nowadays people receive lots of advertisement emails which are the unexpected mails form marketers to sale stuff. This kind of unexpected email calls SPAM or junk mail. There are about 80% of email are SPAM. “Email is at once a ubiquitous and embattled medium because its dependability and trustworthiness are under attack by spam, viruses, phishing, and often inexact ISP filtering; yet it could get worse if email marketing is not centralized within the enterprise, according to a StrongMail/JupiterResearch executive survey, reports MarketingCharts.” People are using email filter to pick up and block the junk mail in order to not receive too much of the SPAM. Marketers would need to go under different direction in order to send the ads mail to their consumers without been blocked by the email filter. Permission marketing would be required before they send the email. Marketers would need to find other legal and ethical ways to get their ads message mail into consumers’ inboxes. In today’s high-tech world, email can also be received on the cell phone devices. “The Jupiter study predicts that wireless ad spending (SMS and display) will reach $2.1 billion by 2011, up 50 percent from present levels – mainly driven by the mass-market penetration of cell phones, ClickZ reports.” From this report, we can see that email marketing will continue to grow in the future through different high-tech devices.