Challenge/Response

Christopher Breen at Macworld posts about a major pet peeve of mine.

Let’s suppose you’ve sent me a message asking for help with a Mac problem. I take time out of my day to find an answer and reply. I’m rewarded for my effort with an automated reply that begins:
I apologize for this automatic reply to your email. To control spam, I now allow incoming messages only from senders I have approved beforehand.

As someone who has multiple free resources up on the web and gets questions about them from random people who stumbled on them nothing annoys me more than spending time answering a question and having the mail bounce back to me.
Hat tip: Mickey