If you're not applying behavioral targeting to your e-mail marketing efforts, you should be, writes Danielle Hickey of Adotas. For some, this may seem elementary, but study after study has shown that a shocking number of e-mail marketers (some representing national brand advertisers) don't target their campaigns beyond demographic and geographic information. (Alright, so I don't have any study in front of me, but I've been covering this business for a while, so trust me.) But, if you collect information about your lists, it's easy enough to deploy some basic behavioral targeting techniques on your own. Past purchase information, …