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Bad e mail addresses are sometimes marked as valid | Knowledge Base ▸ eMail Verifier

Bad e mail addresses are sometimes marked as valid

Knowledge Base ▸ eMail Verifier

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Bad e-mail addresses are sometimes marked as valid

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Question: We tested Verifier on a set of dummy emails, one that we made up knowing they are fake, using both the Yahoo domain and our own proprietary domains for the fake emails. Only one out of five bad email addresses was flagged as bad and the others were confirmed as valid, looks valid, timeout and "scanning". Your software should have identified all five as bad. We ran another similar test on a larger list of 10 emails, half were true email and half were fake. The software flagged ALL of them as valid.

Answer: For some addresses, such as AOL, Yahoo, and other non-SMTP mail, you can't verify whether the address is good or not. You won't know definitively until some bounce. The mail server won't cooperate and as a result addresses will be marked as valid. In fact, a few ISP's mail servers are configured in a way they prevent anybody to find out if an e-mail address is good or not sometimes to protect their customer e-mail addresses from harvester tools. You can get more information about this here: Bad e-mail addresses are sometimes marked as valid.



Stan Busk Stan Busk
August 20, 2018

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Maintain clean mailing lists checking the validity of recipient's e-mails addresses. eMail Verifier can save time and money for businesses who send newsletters to their clients, nonprofit organizations who send bulletins to their members, or any person or business that needs to maintain a clean e-mail contact list.

eMail Verifier is your powerful solution for the standard "message delivery error." Email Verifier verifies every e-mail address from a given mailing list, allowing you to determine 80-90% of "dead" email addresses.

eMail Verifier works on the same algorithm as ISP mail systems do. Addresses for e-mail are extracted from a Domain Naming Server (DNS) and eMail Verifier tries to connect with SMTP-servers and simulates the sending of a message.

It does not send the message though - eMail Verifier disconnects as soon as the mail server informs the program whether the address exists or not. Email Verifier is a very effective piece of software that can verify over 10 e-mails per second .

It can verify single e-mails or huge lists. (eMail Verifier is multithreaded, providing high speed verifying).

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