How to Clean Email Addresses in Bulk

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Cleaning Email Addresses using ListWise

If you have a large number of old or purchased email addresses, before you use them in any way, make sure you process them through ListWise's email address validation service.

The service works on a simple principal whereby you upload your entire list in CSV or TXT format, map the fields and away you go.

ListWise will start cleaning your email addresses immediately and depending on the size of your list, after a few hours you can download the cleaned version of your list.

  • ListWise performs the followig types of cleaning:
  • Remove duplicate email addresses from your marketing lists
  • Remove bounced email addresses
  • Remove invalid email addresses
  • ListWise also fixes common typos in the email address such as (.con instead of .com)

Uploading your List

You can upload your lists as a CSV file or a TXT file. Simply click on the "Upload New Email List" button to start.

When prompted, choose whether its a CSV or TXT file that you're trying to upload.


ListWise is the world's simplest and most accurate email list cleaning solution. ListWise intelligently cleans your list, validating every email, getting rid of duplicates and potential bounces and gives you a clean, fresh list that you can then use for your email marketing efforts.


  • Email:
  • Phone Numbers:
    • Intl: +64 9 309 8288
    • AU: +61 2 9098 8405
    • CA: +1 604 259 1329
    • UK: +44 20 3670 2364
    • US: +1 929 229 4855
    • NZ Freephone: 0800 121 131
  • Level 5, 17 Albert Street,
    Auckland, 1010, New Zealand

Our Location

  • New Zealand Headquaters:
    Level 5, 17 Albert Street,
    Auckland, 1010, New Zealand

    Australian Office:
    CyberCom Global Pty Ltd
    Level 39/2 Park Street
    Sydney NSW
    Australia 2000