I would really like a way to filter out contacts that have never opened an email before. If they are receiving the emails, but have them being automatically deleted I would like to be able to see that they are never opening anything and remove the contact after some time instead of paying for them to keep receiving emails. This would also be helpful in seeing which people that have full mailboxes due to them not using that email anymore. Right now to see if a contacts email is always full I have to click on the contact and scroll through the sent emails to see if any of them say they are opened and for how long their email has been full.
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