Actually, I get lots of Ebot messages for threads where I really did a post, but when I check it, the promised reply is not there. I understand that it could sometimes happen that someone replies, and then deletes it (so that it looks unchanged whenever I visit it later). But it makes me suspicious that this never happened to me until about two weeks ago, but within the last two weeks about half (!) of my Ebot messages are referring to non-existing replies.