I had that happen a few months back, no email, but I sold a phone, had the funds held for 21 days. Now I have been a member on ebay and paypal for 6 or 7 years now, I had only sold like five items before that, and since it was a item consider a high problem area, my funds were held.
Up to that point my feedback and everything on both sides was 100%, all it is , is paypal trying to protect both ends.