What about my HairOfTheDog@FR addy that is here on my profile? That forwards to my home address....
We have mail links on our blog, but ecurbh has them coded I guess so they can't be crawled.
I do think it has to do with enrolling places, signing up for things, who in turn sell the address. I'm somewhat reluctant to enroll for things, but I do when I need to. I've gotten lucky I guess, when I've opted out of contact, the places I've enrolled at have respected that.
It's not an active link, so no "mailto:" html code. Some crawlers are smart enough to look for a character string of the type "name@adress" within a webpage, but that can result in a lot of bad hits, so most rely on finding a "mailto:" code.