It can take up to two business days for a reply. Just wait, as Saturday and Sunday are not business days. Were you filing a counter-notice? That is the only reason people usually email the Copyright Section.
Ok, I just found your earlier thread. If a retraction was successfully filed, you would not have to email YouTube at all; the strike would be removed automatically, and your video restored if it hasn't been deleted by the system.
If the system deleted your video however, you will need to reupload it.