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A new study by email services firm Lyris shows that the average email service provider gets 92.5 percent of emailed delivered to opt-in lists and 88.5 percent more generally. Interestingly, different ISPs filtered out radically different proportions of email as "bulk" messages. Concentric proved the most sensitive, putting fully 61.7 percent of all emails into the bulk folder. By comparison, Hotmail blocked 5.3 percent and Gmail 16 percent. Those domains that most often failed do deliver opt-in emails were Go.com (26.5 percent), iWon.com (25.7 percent) and Gmail (20.9 percent).