Learn how to properly format your contact files for a smooth import into Sender.

Supported File Formats

Sender accepts the following file types:

• CSV (.csv)
• TXT (.txt)
• MS Excel (.xlsx)

Maximum file size: 64MB

File Structure Requirements

Column Headers (First Row)

Your file must include headers in the first row to identify each field:

• Email address (required)
• First name (optional)
• Last name (optional)
• Custom fields (optional)

Data Rows

• Each subscriber must be on a separate row
• All subscriber information should be in separate columns
• No empty rows between contacts

File Example

Download Templates

Not sure how to format your file? Download our ready-to-use templates:

• Excel template – For .xlsx files
• CSV template – For .csv files

Simply fill in your contact information following the template structure.

Tips for Success

• Ensure email addresses are valid and properly formatted
• Remove any duplicate entries before importing (Our system does catch duplicates whether you remove them or not, but this helps the import itself)
• Double-check that all data is in the correct columns
• Save your file in one of the supported formats

That’s it!

If you got stuck on a specific task or can’t find a way to execute a particular job, contact our support team via LiveChat or [email protected] – we’re here to help 24/7.