The best way to effectively utilize email marketing without becoming a spam agent is to only send marketing emails when you have something important to say. If a company sends out marketing emails for no other reason than it’s been two weeks, and the information contained in the email is all fluff, people will start unsubscribing quickly. Create email marketing campaigns with great information. Include articles that can help your clients, such as: How to articles, write-ups from independent professionals, etc. But, if you wait until you have something important to tell the subscribers, they will thank you for it.