Milter-greylist

On Sat, 12 Nov 2005, Emmanuel Dreyfus wrote:
> On Sat, Nov 12, 2005 at 01:52:45AM -0800, Dan Hollis wrote:
>> I think something more flexible would be to integrate lua support, so
>> people can easily script support for mysql/ldap/abcxyz, with their own
>> special site-specific rulesets. They can filter rcpt or domain or helo
>> or any complex combination they like.
> Never heard about this LUA thing. Can you tell more about it?

http://www.lua.org/

It's a very simple scripting language but relatively powerful, easily 
sandboxed, fully supports threads, 100% pure ansi C, reasonable 
performance, and dead simple to integrate. Complete lua engine with all
standard support libraries compiled in only takes ~100kb.

-Dan