Study Found ISPs Blocked 18.7% of Opt-In Email in 2H 2003
The false positive problem is growing, with 18.7 percent of opt-in e-mail now blocked by major ISPs, according to a study by Return Path. The e-mail deliverability company analyzed 30,000 campaigns sent by more than 100 of its clients in the second half of 2003. The 18.7 percent false positive rate represents a 1.7 percent increase over the first half of 2003, and a 3.7 percent increase over the same period in 2002. NetZero was the worst offender, blocking 37.7 percent of permission-based e-mail. SBC Global/Yahoo! came in next with 26.7 percent and Mac blocked 26.2 percent. EarthLink had the best record for deliverability, with only 7 percent of opt-in e-mail being blocked. In the first six months of 2003, AOL blocked around 25 percent of mail, while the last six months saw it block only around 22 percent. The first six months of 2003 saw MSN block 10 percent of permission e-mail, while the second half of the year saw it block around 13 percent. [Full story: Study: 19% of Opt-In E-Mail is Blocked - ClickZ]
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