Duplicated leads

One feature that Interseller has that we find useful is when we input leads, if there is an "error" it'll kick the lead into a "error" bucket. The error could be invalid email but also more importantly that the lead was found in another campaign. It allows us to review that error and decide if we want to clear the error and let that lead into the campaign OR to delete it from the campaign. For example, if the lead is found in a campaign of another colleague just last week, then I probably don't want to add the same lead to my campaign this week. However, if that lead was found in a campaign 6 motnhs ago, then safe to say it's ok to add them to the my campaign this week