![]() ![]() In its turn, about 30% of unavailable addresses which can be determined with domain or email validation software tools, are discovered on the first checking stage (DNS request) and to discover the other 70% the 2nd stage is necessary (SMTP connection emulation). Thus, only about 70% of unavailable e-mail addresses can be determined with the help of software tools. Their availability cannot be checked using software methods. The number of e-mail addresses which belong to such mail services is about 30% of all e-mails. All messages are accepted and then, if an address does not exist in fact, the mail service just sends the original message’s sender a response containing a delivery failure message. The problem is that some mail services do not check the addressees’ e-mail addresses (mail boxes) actual existence in their domains when accepting incoming mail. To check an e-mail address availability, it’s necessary to emulate these stages. 2 E-mail addresses check technologiesĪs it was already said above, there are 2 stages in e-mail message delivery to the addressee: This means that in case of some unforeseen changes in a DNS server records it may take several days before the caches of other DNS servers will be refreshed to provide their users with the updated information. Usually a DNS server stores the results of latest requests for several days to decrease the load on DNS servers and speed up requests execution. There is also a technology of DNS requests caching. And the responsible for information storage about a certain domain is the owner of the domain. What is important to know is that the request to a DNS service can pass through several DNS servers in different areas before you get the response. Such request execution is called recursive.ĭNS technologies are described in details in many public sources and are not the subject of this Guide. com for the address of the server containing the information about the domain (it is ), then connect to this server and send back a response for you. When it receives a request sent by, for example,, it will ask the domain responsible for the zone. com zone which stores the information about domains of this zone.ĭNS server of your provider does not contain any records about or. ![]() ![]() There is a server responsible for domains in the. At the same time the server has information about the domain but no data about other domains. For example, the DNS server stores all information about the domain but doesn’t have any information about other domains (e. To determine the addressee’s server address the request is sent to the DNS service which stores (together with other data) the information about the correspondence between mail services and mail domains which receive messages for them. That’s why you should not associate directly an e-mail domain with the name of the mail server, since messages are often accepted by another computer with absolutely different name. For example, by the moment of this Guide creation the servers mail-com.mr. and mail-com-bk.mr. accept messages for the address while the computers with the addresses and do not accept messages for any e-mail addresses at all. for the address is usually different from the name of the mail server which receives e-mail messages for the address. 2 The sender’s mail server connects to the addressee’s mail server via the SMTP protocol and transmits the message.Ī mail domain (e.1 The sender’s mail server determines the addressee’s mail server using DNS service.There are 2 stages in e-mail message delivery to the addressee: For the details please see the section “Deep (slow) mode of Bulk Verifier”. We recommend the deep processing mode of Bulk Verifier as a slow but high-quality tool for checking of not very large mailing lists. ![]() Optimal data amount for this mode is 70.100 thousand e-mail addresses. In its deep (default) mode Bulk Verifier works significantly slower but provides much more precise results. For the details please see the section “Fast mode of this high speed Bulk Verfier”. We recommend the fast processing mode of Bulk Verifier as a high-speed tool for sifting obvious rubbish out of large mailing lists containing millions of e-mail addresses. This mode does not ensure the highest accuracy of checking but is optimal by expended time and traffic and provides quite sufficient results. In its fast mode this Fast Email Verifier 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 advanced email verifier checks every email address from a given mailing list, allowing you to determine if they still exist.īulk Verifier offers you two processing modes – fast and deep to clean and validate email list and domains. Welcome to Bulk Verifier, an efficient multi-threaded high speed verifier application for checking e-mail addresses and domain availability. ![]()
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