Email marketing

Email marketing may have passed telemarketing in frequency at this point, and is a third type of direct marketing. A major concern is spam, which actually predates legitimate email marketing. As a result of the proliferation of mass spamming, ISPs and email service providers have developed increasingly effective E-mail Filtering programs. These filters can interfere with the delivery of email marketing campaigns, even if the person has subscribed to receive them, as legitimate email marketing can possess the same hallmarks as spam.