Why is my Samsung Galaxy phone automatically moving read Yahoo email to the spam folder? Why is my Samsung Galaxy phone automatically moving read Yahoo email to the spam folder? This usually happens when there is an attachment.
This is another post that I found on this.  Basically the Samsung phone has it's own spam settings.  http://www.slipstick.com/outlook/moves-email-junk-folder/ describes this, and then explains:


  The solution:
  
  
  Go into the E-Mail app (on the phone)
  Press the Menu Key, select Settings, then General Settings
  Select Spam addresses and remove any addresses that should not be in there, such as your corporate domain.