"I already know an awful lot of people and until one of them dies I couldn't possibly meet anyone else."

-- Audrey Hepburn, as Regina Lampert in Charade(1963)

I can be reached by email several different ways, for different reasons. That doesn't mean that I particularly want to hear from you unless I've been in touch with you in some other context...
eichin@thok.org
also for personal or other business mail. This is my home machine, and I usually check mail continuously.
eichin@mit.edu
is mostly a spam bucket at this time; I read it anywhere from weekly to monthly, so don't expect a prompt response.
I have had numerous other addresses at other times, some of which forward, some of which don't.