I don't like getting emails where the first sentence is in the subject line, and the second sentence is in the body of the email. I also dislike forum posts which do the same. For example, this post starts with the words "For example," which to me is confusing. It seems like I just stepped into the middle of a conversation.
Are there any guidelines on this? Is it okay for the body of the post to be a continuation of the text in the title?