I'm sorry if I wasn't clear - adding to trusted_networks is not an option.  
Different users have different needs.  One person might want x.x.x.x 
whitelisted, but another may not.  

I'm currently using the sa_userconf feature in amavisd to do this, but it 
really hurts performance.  From the amavisd-new release notes:

> Each time that currently loaded configuration needs to be replaced by another 
> or restored to a systemwide default, an initial SpamAssassin configuration is 
> restored through SpamAssassin's copy_config() method. Note that saving an 
> original SpamAssassin configuration, loading a user configuration, and 
> restoring to the original configuration does not come cheap: it can take 200 
> ms for a load and restore, and 370 ms for the initial saving of the 
> configuration (saving is only done once per child process, and only if 
> needed). Saved configuration can occupy additional 2 MB of virtual memory, so 
> use the feature sparingly. No penalty occurs until a child process does its 
> first loading of a user configuration, so rarely activated or inactive policy 
> banks or per-recipient setting using this feature do not cause any additional 
> processing or occupy additional memory.

I'm trying to avoid this performance hit.  

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