Earlier quoted context omitted.
This has to be the most unconventional anti-spam technique I've ever heard about.
> I stumbled on it by accident. I was lazy and let the cert lapse, but then noticed that spam signups basically stopped. One day maybe I'll make a post about it with graphs, although I'm not sure I actually have the data. This is intriguing. I'm going to remember this but I'm too anal about perfect A+ TLS and renewal is already fully automated these days anyway :-\ I wonder if one could setup their TLS stack to get t…
Also, if y'all do this, it probably won't work because the spammers will start ignoring expired certs.