Importing, Exporting & Syncing Subscribers

MailFuz Pro provides an enterprise-grade Import & Export Engine designed to process subscriber audiences of any scale—from hundreds of contacts to millions of subscribers—without exceeding PHP memory limits or server request timeouts.

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1. Importing Subscribers from CSV

Navigate to WP-Admin → MailFuz → Import & Export → Import Subscribers:

Ingestion Capabilities

• Low-Memory Streaming Ingestion: Reads file pointers incrementally (fseek and fgetcsv), requiring a constant ~4MB of PHP memory regardless of whether the file contains 1,000 rows or 2,000,000 rows.
• Target Email Lists: Select one or multiple lists during import. All valid contacts are attached directly to the chosen lists.
• Duplicate Protection: Existing contacts have their names updated and new list memberships attached without duplicating email records.
• Download Sample Template: 1-click download of a pre-formatted RFC 4180 CSV template containing standard column headers (email, first_name, last_name, status).
• Dual Execution Modes:
  • Interactive Browser Worker: Real-time progress bar, rows/second counter, and pause/resume buttons for files up to 100,000 rows.
  • Background WP-Cron Worker: Processes asynchronously in the background for massive multi-million row files.

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2. Exporting Subscribers to CSV

Navigate to WP-Admin → MailFuz → Import & Export → Export Subscribers:

Export Filters & Features

• List Filter: Export from a single specific list or export your entire audience across all lists.
• Status Filter: Export active subscribed contacts, unsubscribed contacts, or quarantined suppressed contacts for compliance audits.
• Date Range: Filter contacts added within the past 30 days, 90 days, or all time.
• UTF-8 BOM Streaming: Exports stream directly from the database using chunked database cursors, prepending an Excel UTF-8 Byte Order Mark (BOM) to prevent accented character corruption in Microsoft Excel.

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3. Syncing Registered WordPress Users

To instantly turn existing WordPress user accounts into marketing subscribers, click the Sync WordPress Users tab:

Synchronization Options

• Role Targeting: Select which WordPress user roles to enroll (e.g., Customer, Subscriber, Editor, or custom Frontend Dashboard roles).
• Destination List: Choose the target MailFuz Email List where synchronized contacts will be added.
• Initial Status: Enroll users as active subscribed or set them as pending double opt-in verification.
• Batch Execution: Synchronizes thousands of user accounts in batched chunks without database locking.