I just got an email from AWS support asking for some data, saying, and this is a copy-and-paste quote, “You can provide this information by replying to this message.”
I replied to it.
A minute later I got an error message. Only then did I notice that they’d sent the first email from no-reply-aws@amazon.com, and that “replying to this message” was guaranteed to bounce.
They get me every time.