Jared Reitzin, CEO and founder of mobileStorm, is a columnist in DMNews’ new “Essential Guide To E-mail Marketing.” The special supplement of the news publication—which covers direct, database, and Internet marketing—is available online as a PDF file. Mr. Reitzin’s piece, “So you want to reach the inbox,” gives advice on how to avoid spam filters and gain consumer trust with permission-based email marketing. “The rules keep changing and marketers need to adapt, or it’s going to hurt their pocket books,” he writes.