: When you send to bad addresses, Gmail and Outlook flag your IP. Soon, even your legitimate emails will go straight to the spam folder.

By following these tips and strategies, you can build and maintain a large and engaged email list that drives real results for your business or organization.

A .txt file with 1M entries is too slow for standard text editors.

Never paste a million lines into Gmail, Outlook, or Mailchimp. Mailchimp will ban you instantly.