Dear friends, I need to check the existence of email accounts before sending them mails to avoid going to a blacklist for sending to non real accounts.

I was thinking on (SSL)Sockets and smtp commands but I cant get it to work properly I am shooting in the dark here... Is there any easier way to do this or does anyone have any experience on this??

I have a JAVA application that sends mail to the people that buy certain things but the information quality is bad, so I must check if the mail exists before sending the mail....

Thanks in advance.