Hello @Nonna23 ,   I'd recommend deleting and unsubscribing your recommended-for-removal bounces. This is the quickest way to reduce contact numbers, and remove unusable or dead-end subscribers.   You can also 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, or simply make a list from and delete them. ... View more