Currently amavisd on my mail server is building the quarantine directory like 
this:
/var/lib/amavis/virusmails/
     a
     A 
     b
     B
 and so on.  Files are stored in the directory that matches the first character 
of the message id.    Anyone got a recipe to force the subdirs to be created 
by date? 
If not, I'll continue to RTFM. 
TIA
Dave