Why do you double-check your email list through email verifier before sending mass emails? It's bad luck if you have a bad email address. Since poor email addresses normally result in a hard rebound, this is the case. The email you worked …

A mail tester is software that verifies the existence and validity of a single email address or a group of email addresses. It may be a web application or an internet service. The latter is more common these days because it does not need y…