DM News: E-Mailer Report Criticizes IronPort's Bonded Sender

A report evaluating IronPort's Bonded Sender anti-spam solution - recently endorsed by Microsoft - revealed that a test of the system inappropriately triggered fine payments of would-be commercial emailers in 35 percent of cases. The system requires commercial emailers to put up cash bonds to back promises of good email conduct. If users complain, that bond gets debited, IronPort and the receiving ISP sharing the fine. By setting the maximum complaint threshold at one complaint per million emails, the study found that a great many legitimate commercial emailers, like newsletter publishers, would be regularly and unfairly tithed by IronPort.