You can always view the full message headers and report the spammer to the abuse department at the ISP that delivered the spam to your mail provider. This was c

You can always view the full message headers and report the spammer to the abuse department at the ISP that delivered the spam to your mail provider. This was common practice in the early days of email, there were services that would automate the whole thing for you (spamcop is still around!) and the old ways still work. When gmail was good at detecting spam it really reduced the need for that kind of thing, but it was just sweeping the problem under the rug, out of sight, not actually dealing with the bots sending spam. If google doesn't care to keep up their filtering efforts, maybe folks will have to revert to cleaning up compromised machines and open proxies to keep the spam out.