Importing an address book into Mailpro is fast, but a few technical rules must be respected. Here are the usual culprits behind import failures and how to fix them.
Check first: file format, encoding and expected columns. 90% of failures come from here.
1. File format
Mailpro accepts XLSX, CSV, ODS, VCF. When exporting from Excel, pick "CSV UTF-8".
2. Character encoding
Use UTF-8 to preserve accents (é, à, ñ, ü…). Otherwise your contacts come back garbled.
3. Required columns
| Field | Required? |
|---|---|
| Yes | |
| First / Last name | Recommended |
| Custom fields | Optional |
4. Size limit
Above 100,000 rows, import in batches. Avoids timeouts and makes troubleshooting easier.
5. Invalid addresses
Mailpro rejects emails missing @ or pointing to non-existent domains. Check the import report to see exactly which rows were rejected. See also our missing addresses FAQ.
6. Duplicates
Duplicates are auto-detected and never imported twice.
Pro tip: watch the "how to import your contacts" video for a step-by-step walkthrough.
Still stuck?
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