Inactive subscribers drag down your engagement metrics, such as open and click rates. When a large segment of your email list disengages, email service providers (ESPs) may interpret your emails as less relevant, possibly leading to more campaigns landing in spam folders.
Segmenting subscribers by their last activity is crucial to identify risky contacts that could be pruned by ESPs like Google and Yahoo, causing your emails to bounce. It's recommended to isolate subscribers who have not engaged recently to avoid this issue.
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