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Yes, they have very quick connection drop. So you may use some scripts to make a check or just use the same from as a rcpt to. Example: telnet mta7.am0.yahoodns.net 25 Trying 66.196.118.33... Connected to mta7.am0.yahoodns.net. Escape character is '^]'. 220 mta1069.mail.bf1.yahoo.com...

Thanks for your answer. I do understand and agree with your position, however it is still very interesting from a tech perspective how major List Cleaning companies blame that they do verify addresses. Or they are simply provide with wrong info. Thanks for advise.

I have some list and did a good job through a python script by validation mailboxes for major ISPs like Gmail, AOL, etc., but I have some troubles with Yahoo, since it accept all rcpt to commands and is waiting for a data. Did someone tried to validate Yahoo addresses without emailing to...