The Email Validate Tool is a client utility for checking the validity of an email account.
The tool supports two modes;
VRFY - checks the validity of an account using SMTP VRFY command,
EXPN - is used to find the delivery address of mail aliases also full name of the recipients.
To start the validation process enter the Dns server in the Dns Servers field and the Email address in the Email Address field and click on the button Validate.
During the validation process you will get the warning that very secure email servers will not give any information.