The convention, say with a google-groups based mailing list, is that conversations in mailing list are public by default. With some manual C&P, you can email responses in private.
For cafe participants using web-based email, the situation is reversed, through no fault of their own.
Approx 18 months ago, the haskell-beginners list suffered the same problem [1]. After some digging, it looks like there's a configurable option to Do The Right Thing:
http://ccit.mines.edu/Mailman-FAQ#25So what happened in the aftermath?
Not much that I can tell. Everything just purred along.
Now you might argue that haskell-cafe will just purr along grandly as well given the status quo.
But this is a wrinkle that probably needs some awareness at least, hence this email.
Would you like this fixed? The list owner would need to be obliged upon.
[1]
http://www.haskell.org/pipermail/beginners/2013-January/011304.html