As a long-time former Listserver member, one thing we did there that often doesn't seem to happen here is an acknowlegdment of when an answer has helped (and of course, when one doesn't). Just a little common courtesy...
There are some posts on here where we have no idea if the originator's problem/question/whatever was adequately answered. I would assume the answer was correct/helped/whatever. But we don't know.
This site has a nice function where you can come back and mark a question as answered if it was.
Or, simply make a post saying that what was suggested worked.