You need to add another column to the main contact list page. This column should be a drop down or radio button to add or delete someone from particular groups. This would help us change someone from one list to another etc. For example someone was a potential customer now becomes customer we want to change the type of emails we are now emailing them. It would be much easier this way.
There should also be a feature to search out or filter the people who have not ever opened an email from the sender.
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