After a fairly long and frustrating day, I finally have DKIM working with Postfix on Etch. I was assuming it would be fairly straighforward, but was treated to such lovely errors as these in my mail.log:

smtpd: warning: milter [...] can't read SMFIC_OPTNEG reply packet header: Connection timed out
smtpd: warning: milter [...] read error in initial handshake
cleanup: warning: milter [...] can't read SMFIC_EOH reply packet header: Success
smtpd: warning: milter [...] can't read SMFIC_MAIL reply packet header: Success
smtpd: warning: milter [...] can't read SMFIC_OPTNEG reply packet header: Connection timed out
smtpd: warning: milter [...] read error in initial handshake

I found myself with some spare time the other day and decided that my current mysql backup strategy is not the best in the world. The mysql server is a virtual machine in a Brisbane datacenter and it's backed up via a script that calls mysqldump on each installed database and dumps the content to (compressed) files. These files then get sucked down via rdiff-backup.

This is fine in principle, but does mean it's possible for me to lose 24 hours worth of data due to an accidental '--; DROP table students.