Best strategy to avoid to download all readed emails

[luigisic]

I can read emails with the idIMAP component with code like this:
    IMAP.SelectMailBox('INBOX');
    IMAP.StatusMailBox('INBOX', IMAP.MailBox);
    if IMAP.MailBox.UnseenMsgs  > 0 then ...

But, because the emails are over 3.000 (that increases about of 100 emails per month) this code:
    IMAP.SelectMailBox('INBOX');
runs for about three minutes and more.

This code read even the email readed even I don't want to do anymore.

I needs to repeat read new email ever 10 minutes but i will lost about 3 minutes every time due to IMAP.SelectMailBox('INBOX'); even I don't have new emails.

What is the best strategy to avoid to lost about 3 minutes every time i do: IMAP.SelectMailBox('INBOX');

Thanks