Be advised: this should not be used if you need it to interop with everything and deliver all the mail it receives. The author is on record as being willing to discard mis-encoded messages.
As I understand it, speakers of non-Latinate languages tend to use mail clients which can guess encodings, because there's still a lot of legacy code which does MIME incorrectly or not at all. Hell, Firefox 3 can still do this, and displaying a Web page incorrectly is nowhere near as serious as not delivering email.
People may not appreciate Zed's bluntness but he does tend to make useful stuff that people want. A web server for rails, a non weird-1970s-era framework for email, and now a 'just-works' mailing list system for end-users who, like most, don't really care about the hoops majordomo makes people run through to run a simple mailing list.
I couldn't help reading the site's name each time as "libelist." That's not even a mark against Zed; that's just the effect of trying to smush French and English together without spaces.
http://lamsonproject.org/blog/2009-06-14.html