So there I was, chatting away on IRC on a rainy day, when I noticed an email from amazon.com had crashed policyd-spf. Alarmed by the loss of potential mail, a quick google search revealed this was a known problem (
bug #499504). Reading through the thread, I determined that I had the same problem and proceeded to install an updated version of python-dns from etch-backports:
apt-get install etch-backports python-dns
While looking at backports.org, I was rather disappointed to learn that etch-backports was discontinued as of today. This means at some point, I have to upgrade pain.disasterzone.net to lenny.