E-mail delivery rates held steady at 89% during the second quarter, with 97.1% average rate for the top ten Internet service providers, according to Lyris EmailAdvisor.
The top 10 U.S. domains by inbox delivery rates were mail.com, 97.79%; earthlink.net, 97.74%; peoplepc.com, 97.68%; usa.net, 97.46%; socal.rr.com (RoadRunner), 97.46%; cs.com (CompuServe), 97.08%; yahoo.com, 96.96%; lycos.com, 96.8%; knology.net, 96.3%; and mac.com, 95.97%.
Inappropriate spam filtering among U.S. domains fell from an average 3.3% in the first quarter to 1.4% in the second quarter. Lyris says the drop may reflect an overall trend toward more accurate and sophisticated spam filtering by ISPs and e-mail service providers.
Among the seven domains showing top delivery rates in both the first and second quarters, all showed diminishing rates of blocked or undelivered e-mail messages.
Lyris, provider of e-mail marketing services, monitored 72,406 opt-in e-mail marketing messages sent between April 1 and June 30 from 49 different businesses and non-profit organizations to multiple accounts at 41 ISP and e-mail service provider domains in the United States and Europe.