MailboxValidator is an email verifier app that performs validation on email addresses to check if an email is really exist. This email validation service helps to clean email list and at the same time it also able to maximize email open rate, conversion rate and sender reputation. User can verify an email address instantly to reduce bounce rate and cost. It is important in internet marketing as well as email marketing campaign because it may help you to reach your real audience with zero bounce rate. MailboxValidator helps to reduce invalid emails by checking if the email is syntactically correct, if the mail server records exists in DNS, if the server is responding to connections, if the email is from a free email provider, if the email is from a disposable email provider and if the email address contains any high-risk keywords and so on.