links for 2008-01-25

• SiteVista/Litmus adds new tool: webmail spam filter checks
  (tags: tools)
• RetailEmail.Blogspot: Retail Email Unsubscribe Benchmark Study: Executive Summary
  While major online retailers do a great job of honoring unsubscribe requests quickly, there’s plenty of room for their opt-out processes to improve, like providing subscribers with alternatives to opting out and of lowering barriers to opting out.
  (tags: study)