Listclean | Knowledge Base Welcome to our Support Center Search Getting Started Email Validation Process How Does List Cleaning Works? How fast will you process my list cleaning request? PHP Example Uploading Files Uploading Files Supported File Types Convert Excel to CSV Opening a CSV in Excel Can I leave other columns of data in my list? Email Validations Results What is Clean email address? What is Dirty email address? What is Unknown email address? What is High Quality? What is Medium Quality? What is Low Quality? FAQs Billing and Payments Potential Issues Questions about our services List's Dirtiness Status Explanation What is Accept All/catch all ? What is Disposable Email Address? What is Role Based Emails?