High Speed Verifier (HSV) is a high-speed software
designed to check e-mail address for existence. HSV is
capable of checking thousands of addresses per second.
It can easily deal with mailing lists containing tens
millions of addresses; moreover, it is with this list
size that the program's highest performance can be
achieved.

HSV detects about 20-30% of invalid addresses in a
mailing list, though theoretically it is possible to
detect up to 60-70% using a software product. This
figure seems relatively small, but actually it might
make 10% of a list. Besides, HSV provides for optimal
checking mode in terms of time and data traffic. More
thorough checking (with which the rest 40% of dead
emails could be detected) takes 10 times longer and
requires 5 times greater traffic for each
address, hence it's not that advisable with huge lists.

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