How To Check If An Email Is Valid Without Sending An Email . I'm sending email using smtp services in my c# windows application. This is an especially popular option for regular email marketers and others used to send numerous emails.
A crude way of spotting them would be sending an actual email address and waiting for the message to either be delivered or bounce. That being said the method described there is quite effective. After the dns lookup, you can validate the email address via smtp connection.
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You'll also be able to confirm if your own email id has been specifically blocked by other recipient or mail servers. I have to check the. Replace the test email address with your recipient email address. It is used in production code in zonecheck except that it uses rset instead of quit.