Spam is a never-ending problem. Overall spam levels in August 2007 increased to an average of 69% of total e-mail, according to the September issue of Symantec's monthly spam report. It seems that no sooner does a spam-blocking firm or ISP identify and stop a spam phenomenon than a new one pops up. DMNews spoke with AOL postmaster Charles Stiles about the state of spam, the lingering challenges and what this means to legitimate e-mail marketers.