Welcome to BulkVerifier, an efficient multi-threaded application for checking e-mail addresses and domain availability. Quickly and easily verifies email addresses, huge domains and clean up your mailing / domain list. A powerful advanced bulk domain and email validation tool.

BulkVerifier v2.1 offers you two processing modes fast and deep.

In its fast mode BulkVerifier works extremely fast being able to process mailing lists containing dozens of millions of e-mail addresses at a speed of several thousands addresses per second. This mode does not ensure the highest accuracy of checking/cleaning but is optimal by expended time and traffic and provides quite sufficient results. We recommend the fast processing mode of BulkVerifier as a high-speed tool for sifting obvious rubbish out of large mailing lists containing millions of e-mail addresses.

In its deep mode (default), BulkVerifier works significantly slower but provides much more precise results. Optimal data amount for this mode is 70...100 thousand e-mail addresses. We recommend the deep processing mode of BulkVerifier as a slow but high-quality tool for checking of not very large mailing lists.

Fast mode of BulkVerifier

In this mode BulkVerifier is able to process mailing lists containing dozens of millions of e-mail addresses at a speed of several thousands addresses per second...

Deep (slow) mode of BulkVerifier

In the deep (slow) mode BulkVerifier performs a complete two-stage check of e-mail addresses availability...

E-mail addresses check technologies

There are 2 stages in e-mail message delivery to the addressee...