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Bulk Verifier

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Description

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.

Benefits

  • Incoming file formats - BulkVerifier domain and email verifier tool can process both plain list of e-mail addresses / domains where each line contains one item and files of more complex structure like CSV file where lines represents multi-field records of the same structure (i. e. containing the same fields separated with the same delimiter). For example, you can export a worksheet of an MS Excel file to check availability of e-mail addresses/domains listed there. It’s supposed that one line of an incoming file contains one e-mail address and/or one domain. To specify the format of the incoming file please turn to the Options dialog.
  • BulkVerifier internal cache - This advanced email verifier stores domain check results in the internal cache. If another e-mail address from the same domain will be found in the same mailing list, Bulk Verifer will not request the DNS server once again but will use the result from the cache. Cache size is limited only by the memory size of your computer. It takes 40 bytes of memory to store the result of one domain check. Thus, it will take 40 MBytes of memory to store the results of check of one million different domains. The time spent to find a previous check result in the cache practically does not depend on the cache size.
  • Timeouts - The quality of DNS servers list used by BulkVerifier (OptionsDNS) also influences deeply the application performance. If Bulk Verifier does not receive a response from a DNS server in a specified period of time (OptionsTimeout, in seconds), it makes new attempts using another DNS service from the list each time. If all these attempts failed, the e-mail address is listed as not checked due to the connection timeout. The bigger the list of DNS servers which can be used by E-mail Verifier, the less is the probability that a couple of DNS servers which have operating problems will affect the application’s performance.
  • Multithread processing - This bulk domain and email verfier is a multi-thread application. You can define up to 600 threads which will be used simultaneously (one thread is used to check one e-mail address/domain from mailing list and determine if domain/e-mails are still valid).



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