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Constant Contact Contact Import Failed or Rejected

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Workaround available Web Updated November 13, 2026Based on 3 user reportsHow we research

Quick answer

Imports fail when over half the list is suppressed, invalid, toxic or purchased addresses, or when the file format is wrong. Clean the list with a verifier and fix the CSV columns.

Most likely fix: Check Import History

How to fix it

Try these in order — the most common fix is first.

  1. 1. Check Import History

    1. Open Import History; rejected imports show as Import List Name - Rejected
    2. Hover over Details in the Error Log for the reason
    Did this fix it?

  2. 2. Verify and clean the list

    1. Run the file through a verification service (BriteVerify, Kickbox, Webbula)
    2. Remove invalid, disposable and role-based addresses
    3. Only import contacts who opted in, then re-import
    Did this fix it?

  3. 3. Fix the file

    1. Add a header row and an Email column
    2. Add an Is Unsubscribed column: 0 for opted-in, 1 for not
    3. Keep under 100 columns and 1 million cells
    4. Rename the file without accented characters, save as CSV or XLSX
    5. Make picklist and checkbox values match your custom fields exactly; separate checkbox values with commas, no spaces
    Did this fix it?

  4. 4. Still failing

    1. Email policy@constantcontact.com
    Did this fix it?

Symptoms

Import is rejected, shows an error, or contacts do not appear after uploading.

Why it happens

  • List quality check: more than half the addresses are suppressed, invalid, toxic or purchased
  • CSV over 100 columns or 1 million cells
  • Missing header row, Email column or Is Unsubscribed column
  • Accented characters in the file name (internal_server_error)
  • Custom field values that do not match case-sensitive picklists

This guide also covers

  • constant contact import error
  • constant contact import failed
  • constant contact list rejected
  • constant contact upload contacts not working

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