MailList Validator is an application for checking the validity of email lists. MailList Validator sends special requests to each address and analyzes the mail server responses. The program also allows you to check e-mail addresses in a fast mode - through sending DNS queries and analysis of MX servers of the domain to which this or that e-mail address is "assigned". In addition, the user can create his own rules to check, which eliminates the possibility of assigning good addresses to the list of non-working ones. The test is performed in multithreaded mode, which allows you to test hundreds of addresses simultaneously. The size of the list with addresses to check can be as large as you like - up to 4 GB. The program can import email lists from CSV and text files, Windows address book, and ADO/ODBC data.