Segment and Re-engage Inactive Subscribers

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Reduce Costs: Most email service providers (ESPs) charge based on the number of subscribers. A clean list means you're not paying to send emails to non-existent or unengaged contacts.
Ensure Compliance: Regulations like GDPR and CAN-SPAM require you to have consent and provide easy opt-out options. Auditing helps ensure you're only emailing those who have explicitly opted in and that you're managing opt-outs correctly.
Gain Insights: Analyzing list segments and engagement patterns can reveal valuable insights into your audience's preferences, allowing for more targeted and effective campaigns.
How to Audit Your Email List: A Step-by-Step Guide
Aim to conduct a thorough audit at least taiwan email list once a year, with more frequent smaller cleanups (e.g., quarterly or monthly).

Gather Your Data:

Export your entire email list from your ESP.
Collect performance data for recent campaigns (last 6-12 months): open rates, click-through rates, bounce rates (hard and soft), unsubscribe rates, and spam complaint rates.
Identify engagement metrics: Most ESPs allow you to track "last engaged" (last open or click) for each subscriber.
Define Engagement & Inactivity Thresholds:

Decide what "inactive" means for your business. Common thresholds are 90 days, 6 months, or even 12 months with no opens or clicks. This can vary based on your industry and email frequency.
Perform Initial List Cleaning (Hard Bounces & Duplicates):

Hard Bounces: These are permanent delivery failures (e.g., non-existent email address). Your ESP should automatically suppress these, but it's crucial to ensure they are permanently removed from your active list.
Duplicates: Remove any duplicate email addresses to avoid sending the same message multiple times to one person, which can be annoying and unprofessional.
Syntax Errors: Use an email verification tool (see step 4) to identify and remove emails with incorrect formatting
Utilize Email Verification Tools:

Services like ZeroBounce, NeverBounce, Kickbox, or Hunter.io can analyze your entire list for:
Invalid emails: Non-existent addresses.
Disposable emails: Temporary addresses often used for one-time sign-ups (e.g., Mailinator).
Spam traps: Email addresses set up by ISPs to catch spammers. Hitting these can severely damage your sender reputation.
Catch-all domains: Domains that accept all emails sent to them, making it hard to verify if an address truly exists.
Run your list through one of these services to identify high-risk emails for removal.