Daily spam from same source

Every day I get at least 30 spam emails from this source:  < http :// ow. ly/ *******>' The last few characters are randomized so new 2 emails share exactly the same address, so marking one as spam does nothing to prevent the next ones. What is common is the ow.ly - also sometimes ow.li. Is there no way for the spam filter to pick up the ow.ly and stop right there?? It's always spam!!