check email existence using Delphi with Indy or any other components/tools for Delphi -

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I need to check email accounts if I do not need to use Delphi and Indie (if If possible)

I have a Windows database for the ERP system and I need to make sure that the customer enter the valid email in the system so that I can send the quotes to my customer which they request We do.

I tried to test on Yahoo and Google on the order of sending mail and RCPT but did not get the success.

Protect the mail server against spammers and others with malicious intentions, they can easily Are not going to leave This is normal for configuring the mail server for the black hole message sent to non-existent recipients. They do not respond to the sender, "Sorry, that user does not exist, please try again."

Therefore, if you want to verify that the e-mail address is a person or not, I believe that the only way to ensure that e-mail is to request a response, Sending mail

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