Hello @JennyG ,
Simply removing contacts from lists doesn't make them inactive / non-billable. You'll want to fully remove unviable contacts, like bounces and low-engagement contacts.
You can use segmentation to filter out contacts who've chronically not opened your emails. You can then further manage this segment by adding it to a list, determining which contacts may still be worth keeping (such as very recent additions based on Date Added), and then deleting all the remaining non-openers and the segment list. There's also our pre-built low engagement segmentation, which you can use to re-engage those specific contacts that rarely if ever open your emails.
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