By the Stats: E-mail Marketing Spend to Hit $1.1 Billion by 2010

¥ Spam e-mails per consumer should drop 13 percent annually to 1,640 pieces in 2010, down from 3,253 pieces last year.

¥ E-mail delivery rates should surpass 90 percent in the next few years, up from an average of 88 percent currently.

¥ Incorrectly blocked e-mail will cost marketers $92 million in 2010, down from a record high of $107 million this year.