Back to Blog
Guides
How to Clean Your Email List Before a Campaign
Priya SharmaJanuary 25, 20266 min read
list cleaningcampaign preparationbest practices
How to Clean Your Email List Before a Campaign
Remove Duplicates
Dedup your list first. Duplicates waste credits and annoy recipients.
Fix Formatting
Scan for extra spaces, missing extensions, special characters. Fix automatically where possible.
Run Bulk Verification
Upload entire list. Remove invalids. Quarantine risky for separate handling.
Check Suppression Lists
Cross-reference against master suppression list: bounces, unsubscribes, complaints, spam traps.
Segment by Engagement
Active (opened/clicked in 90 days), lapsed (90-180 days), dormant (180+ days). Consider excluding dormant.
Remove Role-Based
Unless explicitly opted in, remove from marketing campaigns.
Check List Age
If not mailed or verified in 6+ months, treat with extra caution. Verify separately and send gradually.
Final Review
Compare final size to original. Document what was removed and why to fix root causes.