If anything, it's worse than ever. The favored technique these days is "snowshoe" spamming, where $SPAMMER sends a trickle of spam from a large number of IP add

If anything, it's worse than ever. The favored technique these days is "snowshoe" spamming, where $SPAMMER sends a trickle of spam from a large number of IP addresses. About the only way to stop it is to block the /24, and then they just move on to the next block of IPs they want to ruin. RBLs like Spamhaus are helpful, but there will always be a few spammer IPs that haven't yet been listed. SpamAssassin can be handy, but it's a pain and there's a lot of rope you can hang yourself with. Blocking certain TLDs outright (.cam is a good candidate not just because of this, but also the phishing potential) can be an option.