Things may not be as bad as some make them sound, however.
According to 2,327 marketers who reported their data in MarketingSherpa's Email Metrics Survey last week, email marketing results as evidenced by open and click rates are unchanged from 2002 - despite spam overload. Only 5-6% of marketers say their open rates for house lists have "decreased significantly," while 15% say they've actually "increased significantly."
Just 5% of marketers say their click rates for links sent to house lists have decreased, while 18% say clicks have increased. The majority of marketers who track rented list performance say that they have seen "not a big change" in both opens and clicks over the past 12 months.
MarketingSherpa says the data shows that "permission email is here to stay as a viable tactic -- despite spam overload."
Additionally, MarketingSherpa discovered two factors responsible for much of email's continued success: significantly increased measurement and testing. In 2002, up to 50% of marketers using email did not track the data they would need to run tests to improve results. This year the non-trackers are down to as little as 1/5th of the marketing population.