- BostInno,  Friday, September 14, 2012 3:59 PM
                                
                            
                        
After being dubbed at launch, "refreshingly difficult to game" in 2010, marketers have now spent enough time with Gmail Priority Inbox to accumulate some learning and best practices. Double opt-in,
using effective keywords and varying the sender are all tactics that help marketers get past Gmail's velvet rope. 
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