19: Accidental Deployments

I’ve been trying to focus on Run Your Own Mail Server throughout October, and making some progress.

Greylisting is a divisive technique. The first time a site mails your server, greylisting delays messages from ten minutes to a couple hours. If people in your organization insist that email is instantaneous despite all evidence to the contrary, that’s a problem. If some web site uses email to send authentication codes that are valid for only ten minutes, that’s an problem. (The problem is that th...