Bulk Mail Verifier is a tool that quickly and accurately verifies email addresses. This is done by looking up the domain in a database of email bounce tester addresses. Bulk Mail Verifier is a tool that quickly and accurately verifies email addresses. This is done by looking up the domain in a database of verified email addresses. Bulk Mail Verifier is an email verifier that helps you verify your email address with 100% accuracy. It is a one-stop solution for all your email verification needs.