Digital marketing company Bluestreak is launching its BlueVision email diagnostic service, which combines optimization technologies with strategic testing, reports DM News. The services is intended to increase open rates, interaction and message relevance. "A lot of marketers just want to do simple A/B testing, but we found there are really four factors that can dramatically increase response: the friendly from, the subject line, the creative and the offer," Bluestreak CEO Annette Tonti said.