[tmtvl]

I read that the source won't be made available because it contains some anti-spam (anti-abuse?) measures that would be easily circumvented if the source were open. Security through obscurity is famously no security at all, but I can see how it can reduce the noise that dang has to deal with a bit.

[darthrupert]

Anti-spam isn't security in that sense. Perfection is not required when dealing with irritation.