Forrester Reports on E-Mail Service Providers
December 30, 2009

Sixty-nine criteria were used to gauge the E-Mail Service Providers (ESPs), divided into three buckets: current offering, strategy and market presence. Forrester said the 15 ESPs were selected from a potential group of 40, using firms with at least $10 million in global billings and those that send 200 million-plus emails a month, among other benchmarks.