Duplicate Email Check Fixed Jun 2026

If a user unsubscribed under one email variant but you keep another variant active, you breach their preference. Always cross-reference unsubscribes before deduplication.

Duplicates might have different emails but the same person. A true duplicate check should consider other identifiers (name, phone, customer ID) to merge records. duplicate email check

Google Sheets users can utilize the Unique function. By typing =UNIQUE(A:A) into a new column, the software generates a fresh list containing only the first instance of every email address. This is a non-destructive way to clean data while keeping your original list intact. Automating the Process with Tools If a user unsubscribed under one email variant

Run a script or use a tool to generate a “Duplicate Report” every month. Review fuzzy matches and merge as needed. duplicate email check