Had some rather serious mail server problems which are fixed to an extent now. It still has a problem that qmail doesn’t seem to like the new libc6 from deb-unstable; not much I can do about that at the moment. The mail works, just don’t expect any of the error messages (bounces, etc.) to make sense, they come out as rubbish at the moment.
I will try and sort this asap. (could require a complete rebuild of the box tho :()