Spending on email marketing will reach $1.1 billion in 2010, growing at a compound annual growth rate (CAGR) of 4.5 percent from $885 million in 2005, according to a Jupiter Research forecast, writes InternetRetailer. Also, the average number of spam emails per consumer is forecast to decrease at a CAGR of 13 percent, to 1,640 per year, from 3,253 in 2005. Email delivery rates have now stabilized at 88 percent, on average, and will surpass 90 percent in next few years, according to the report.

Also according to Jupiter, B2C email marketing spend will increase at a 5 percent CAGR, reaching $897 million by 2010, whereas B2B email spending is expected to grow at a CAGR of only 2.4 percent, reaching $206 million in 2010, writes DM News (via MediaBuyerPlanner).

Email address churn has been at its highest level within the last year thanks to the speed of broadband adoption in the U.S., making list hygiene a challenge for brokers.