Is there any way to runtime-load the postgresql map type into the 
system-supplied postfix?  If not, my only alternative is to remove the 
postfix binaries the system supplies and use pkgsrc, which defeats the whole 
push for postfix in the base installation in the first place.

IMHO, the default MTA supplied with NetBSD should be a simple "contact this 
list of outgoing mail servers" type thing.  I suspect other OSs do this.

--Michael