E-mail service providers have panned IronPort Systems' Bonded Sender program in an internal industry report, saying it does not treat commercial e-mailers fairly.

The E-mail Service Provider Coalition's vendor relations committee recently completed a report on Bonded Sender. The report, a copy of which was obtained by DM News, details several shortcomings the committee found in a test of the e-mail reputation system that Microsoft has endorsed.

The ESPC said three of its members tested the program with 39 Internet protocol addresses. Some clients saw incremental delivery improvement while others saw none. The report details several areas of concern that it concludes could make Bonded Sender a losing proposition for e-mail marketers.
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