E-mail marketing spending will continue to expand at double-digit rates — 18.5% per year — for the next five years, according to Veronis Suhler Stevenson, a private equity firm, in its annual Communications Industry Forecast published on August 3. VSS specializes in the information and media industries. VSS puts the total spend for e-mail at $11.9 billion in 2008 and, by 2013, it forecasts e-mail will be a $27.8 billion business.