35% Higher Open Rates After Database Cleaning

The Challenge

The nonprofit had built their donor database over 15 years. But email performance had been declining for the past three years:

• Open rates dropped from 28% to 16%
• Bounce rates climbed to 12%
• Email provider threatened to suspend their account
• Year-end fundraising campaign was approaching

The development team suspected data quality issues but didn't have the resources to manually verify 45,000 donor records.

The Solution

The nonprofit ran their entire database through Clean Leads 365's email verification:

• Syntax validation: Caught malformed email addresses
• Domain verification: Identified defunct email providers and domains
• Mailbox verification: Confirmed active, deliverable addresses
• Risk scoring: Flagged spam traps and disposable emails

The Results

The cleaning process revealed significant data quality issues—and fixing them transformed engagement:

The year-end campaign that followed was the nonprofit's most successful in five years.

Key Takeaways

• Nonprofit databases accumulate invalid emails over time
• Poor list hygiene damages sender reputation and deliverability
• Smaller, clean lists outperform larger, dirty ones
• Regular cleaning should be part of database maintenance