Initial mod_smtpd code.

[Rian Hunter]

Hi,

This is my first attempt at writing an experimental version of  
mod_smtpd. I don't yet have svn access yet so this code can be  
downloaded from http://rian.merseine.nu/mod_smtpd-0.1.tar.gz.

This implementation shows my vision for mod_smtpd and it isn't  
perfect, so please test/look at the code and think about where its  
method of extensibility works and doesn't work. This implementation  
is different from Jem's view of hooks for each smtp command (i do  
something similar but not so drastic as hooks for each smtp command,  
i have a apr_hash_t with function pointers for each different smtp  
command).

Jem/Paul/Nick: I'm especially interested in what you think about the  
design I've laid out in this implementation.
-rian