The report was based on data from a survey of 1,900 consumers age 18 and older who live in the United States.
Some 7% of respondents say the marketing emails they receive are always useful, and 8% say they are frequently useful.
In addition, 29% of respondents say marketing emails are sometimes useful, 33% say they are rarely useful, and 24% say they are never useful.
Younger respondents, those age 18-29, find marketing emails more useful in general than do older respondents (age 30+).
Some 56% of consumers say they receive way too many marketing emails; 23% say they receive a few too many marketing emails; 12% say they receive the right amount; and 8% say they receive too few.
Some 41% of consumers say they will ignore an unwanted marketing email, and 41% say they will unsubscribe from the sender's list; 11% of consumers say they will move an unwanted marketing email to the spam folder, and 7% say they will report it as spam.
About the research: The report was based on data from a survey of 1,900 consumers age 18 and older who lived in the United States.