Milter-greylist

Hi,

I'm using milter-greylist 3.03 on Ubuntu. I've seen the feature to 
autowhitelist a set (MTA/from addr/to addr) dynamically via the mxsync 
interface. Now I would like to do exactly this but without specifying 
the MTA (i.e. have it a "match all" or *). The idea behind is that we 
have a system that scans all outgoing email and extracts the 
sender/recipient pairs. We would like to feed the inverted pair to the 
autowhitelist, so that answers from our communication partners will be 
accepted directly.

Is that possible?
- with my version of milter-greylist (if yes, how?)
- with a newer version of milter-greylist (if yes, how?)
- not at all

It seems the mxsync insists on getting an MTA addr specified.

OK in the meantime I found a fallback solution in case there's no better 
one: completely disable IP checks with -L 0

But I hope for a more elegant way :-)

Thanks for your help!
Carsten