To folks going to 37C3: Don't visit the talk about SMTP smuggling. The authors of it have not done responsible disclosure to postfix about a security vulnerability with some configurations (default configurations, in fact). Let them have empty seats.
@kescher@ar The "oh we didn't realize we had to look further after Cisco told us it's fine" seems extremely disingenuous given that the research specifically identifies postfix as a large affected implementations (and given that they seemed to disagree with Cisco's assessment anyway)