How to delete email message from POP3 server after processing mail.

Hi ,

I am doing one POC in which I have to read email messages from POP3 server , send mail to some http server and then delete email from server.

I am using gmail pop.gmail.com for testing this is working for sucess scnerio but here is my requirement for error scenerio.

1) If I am not able to send mail to target this shouldn't delete message from server and process again once its scheduler starts.

How can I achieve this because problem with pop3 server is once message is retrived this automatically delete message.

Thanks