Having to manually delete literally thousands of Contacts by hand because there is no easy way of getting rid of them. Either 1) have the Action selected from the drop-down only apply to the current view, like most applications. This would allow you to sort on email as a filter, and easily delete them in batches. Or 2) make your list filters better, so you can create a list of only those Contacts with a 'null' in the field. Both of these ideas would make Contact management easier.
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