Verifying an email address is a part of the registration process in many websites and services. You might need to enter a valid email address in the text box given and some information with an activation link is usually sent to the email address provided. You have to open your mail box and click the link in the email that arrives for that particular service. Upon clicking the link, your email address is verified as genuine by the service provider. This is how an email address is verified in any registration process. This allows the service provider to remove the invalid addresses from their database.
There are commercial products available in the market for verifying the emails that you have in your mailing list. These products allow you to send a confirmation email periodically and any mails that are bounced back or could not be delivered are removed from the database. Some web services are available in .Net that enables you to check an email address you have. These web services can be integrated into any application for verifying an email address.
[tags]Voice Mail, Chat, Blog[/tags]