High Percentage of Unengaged Subscribers

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Unengaged subscribers are email addresses on your list that have not opened or clicked on any of your emails for a significant period. While they might technically be valid, their presence indicates a lack of interest and actively harms your list health.

Definition: The threshold for "unengaged" varies, but commonly it's defined as someone who hasn't opened or clicked an email in 90 days, 6 months, or even 12 months, depending on your sending frequency and business model. For a daily sender, 30 days might be unengaged; for a monthly sender, 6 months might be appropriate.
Why They're a Problem:
Drag Down Engagement Metrics: These lebanon email list subscribers contribute to your "emails sent" count but not to opens or clicks, artificially deflating your engagement rates and making it harder to accurately assess campaign performance.
Waste Sending Resources: You are paying your ESP to send emails to people who aren't interested, increasing your costs without increasing your ROI.
Contribute to Deliverability Issues: ISPs interpret persistent non-engagement as a sign that your emails are not desired. Sending to a large segment of unengaged subscribers can signal to ISPs that your content isn't relevant to your audience, which can negatively impact your sender reputation and inbox placement for your entire list. Unengaged users are also more likely to hit the spam button or ignore your emails entirely.
Potential Spam Traps: Very old, unengaged addresses are often recycled by ISPs into spam traps. Continuing to send to them significantly increases your risk of hitting these traps.
Identification and Management: Regularly segment your list by engagement level. Identify and isolate subscribers who haven't engaged in a specific timeframe. These segments are prime candidates for re-engagement campaigns or, failing that, removal.
B. Numerous Typos and Formatting Errors in Email Addresses
These are clear indicators of poor data collection practices or a lack of proper validation at the point of entry.

Source:
Manual Entry: Human error during manual data input (e.g., [email protected] instead of [email protected]).
Poor Form Validation: Signup forms without real-time email validation that allow invalid formats (e.g., missing "@" symbol, incomplete domain like example.com.).
Data Migration Issues: Errors occurring when transferring lists from one system to another.
Scraped or Purchased Lists: These lists often contain a very high percentage of malformed email addresses because they weren't collected directly from willing subscribers.