I have a self signed cert for TLS and HTTPS. It doesn't get any serious use, so is largely irrelevant, but in an ideal world I would have a real cert. They're a little more than I care to spend, and I only want to prove the identity of the machine, not an organisation.
Are there any viably cheap cert authorities anywhere?
(the fact that postfix valiantly tries to forward mail to TLS hosts also makes me want to do it)