Comment spam comes from humans who are paid to post it and robots/scripts that do it automatically. The majority of spam comes from the bots. There’s very little one can do to defend against a determined human being, but bots tend to behave predictably, and that allows us to develop countermeasures.
From my observations, [...]

My clients and I have been receiving increasing amounts of spam sent through our own contact forms. Not being a spammer myself, I’m left to speculate on how one sends spam through a webmail form, but I’ve come up with two ways of preventing it from happening. Both of these methods involve editing [...]