Yes — Mailpro auto-detects and handles duplicates across your base, on import and between lists. No contact is ever billed twice.
Pro tip: the same contact in 5 lists counts only once in your quota — Mailpro bills unique contacts.
How it works
- On import: Mailpro compares each row to your existing base
- Duplicate found: the row is skipped, existing fields are preserved
- New fields: optionally fill empty fields with imported data
- Full report: every skipped duplicate is listed
Cross-list detection
If the same contact lives in 3 different lists, Mailpro:
- Counts them as one unique contact for billing
- Allows membership in multiple lists
- Sends just one email per campaign, even when several targeted lists overlap
Manual cleanup
If you imported manual duplicates (e.g. [email protected] and [email protected]):
- Open Contacts → Tools
- Run Duplicate detection
- Choose the merge strategy
- Mailpro consolidates fields, keeping the richest values
More on the duplicate management page.
What you gain
- Savings: only unique contacts are billed
- Deliverability: one email per recipient = no complaints
- Clean stats: real open rates, no skew
- Brand image: no awkward duplicate sends
Clean contact base from the very first import. Start free with Mailpro and let automatic dedup do the work.
Related guide: How to manage email lists: 16 best practices