This windows forms application allows you to verify the existence of an e-mail address mailbox.
It also allows you to connect to a SQL database, select a table, and define the column containing the email address values, it will then check the existence of each email address inside the table, and stores the value in a temp column inside the application. You can then export/copy the results to an excel sheet, or any other software of your choice.
PLEASE NOTE: The application will not ammend your database and/or SQL table in any way.