E-Mail Volume Increases, Testing Lags Behind

* 55.2 percent said they segment their e-mail marketing lists, but 44.8 percent do not;

* 32.2 percent of the respondents who do test e-mail marketing campaigns test two versions, 11.5 percent test three and 2.3 percent test four;

* 46 percent said they test e-mail subject lines; and

* 19 percent said they feature customer reviews in some of their marketing e-mails.