High Speed Verifier (HSV) is a high-speed software designed to hindrance e-mail plow for world. HSV is capable of checking thousands of addresses per endorse. It crapper easily treat with mailing lists containing tens millions of addresses; moreover, it is with this inclination size that the programme's highest performance crapper be achieved. HSV detects about 20-30% of invalid addresses in a mailing inclination, though theoretically it is possible to detect up to 60-70% using a software product. This figure seems relatively little, but actually it might make 10% of a inclination. Besides, HSV provides for optimal checking modality in terms of time and data traffic. More thorough checking (with which the rest 40% of utterly emails could be detected) takes 10 times longer and requires 5 times greater traffic for each plow, hence it's not that advisable with huge lists.