I would like to see the ability to upload suppression lists that can be used as part of an email send. Here's a use case: I send out an email inviting users to a live demo. I want to send out another email to those who haven't signed up for the live demo 1-2 weeks later to help increase registrations. I don't want to send to those who have already registered for the event. Instead, I want the ability to add those who registered to a suppression list so they will not receive email #2, and so I don't have to manually remove those who registered from the initial list. This is actually a standard feature that is already available in many email platforms. It would be nice if Constant Contact included this feature to help streamline the list management process.
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