In fact, it's so powerful it even managed to block emails from my site's domain host telling me tremble.com was set to expire today, and that I'd need to renew it if I wanted my site to hang out for a little while longer.
Whenever I have a problem with this site, I write my webhost (not my domain host) a very hurtful email. This has become one of the small pleasures I enjoy as a consumer. I like to remind them that they've failed me many, many times in the past, and that my other webhosts have been exemplary mates by comparison. And, just like in my inter-human relationships, I usually receive a response that plainly and tersely shows me exactly how I, not they, was actually wrong.