Hi all -  Several years ago, I was with another mass marketing service provider that had a tool that allowed you to include your list of recipients, but also include a list of emails you want to exclude from the full list.  For example: You send an email inviting 500 people to a reception. You have a list of the 500 who are invited, but you want to omit those 150 people who are already registered. With my previous service, you could upload a list of the 150 who are registered and the system could omit those emails from the list of 500 people for that specific email.  Is there an option/way to do that in CC?  I asked CC about this several (maybe 5) years ago and was told it was a feature they were working on. Just curious if anyone knows or can share insight. Thanks! ... View more