[mhd]

I registered way back, and subscribed to two mailing lists to try it out. That exposed a major flaw to me: Conversation views are in reverse time order. Which is kinda okay if you're talking to an actual person and might just want to look up what you previously said, basically an extended version of (goshawful) top-quoting. It does break apart if you're trying to get into a new mailing list conversation where you have to read through 10 posts.

If it had an option of reversing that, it wouldn't actually be that bad. Not as good as gmail, but better than all the desktop-clones like gmx.com or yahoo.