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# How do I make sure I don't send emails to the same people twice?

When you set up a new campaign, we detect duplicate emails so that people are not contacted twice - we don't want you to be called a spammer!
  
In addition, we also check to see if emails are already in other campaigns.
  
So even when you're running multiple email campaigns, you can be sure that the same potential customer won't be bombarded with too much content or too many messages at any given time.