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 the web site is delivering ephemeral data via an unsuitable protocol but still, you must cope…
The skinny
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