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HAHA. MAIL SET UP.
I had to tweak opensmtpd to let us send mail from the VPS to the VPS (which is our mail server) – it was getting stuck in an infinite loop trying to relay the message to itself. Putting "receive messages for us" before "relay outbound messages elsewhere" fixed that problem.
And adding an "us@domain" to /etc/aliases means we can now get mail from things like cron, I hope. :3
