Per domain configuration of qmail-qfilter

Could someone share or explain how qmail-qfilter can be used in a per
virtual domain scenario.

#!/bin/bash
exec /usr/bin/qmail-qfilter \
	/usr/local/anomy/sanitizer.pl
/path_to_virtualdomainpath/sanitizer.cfg

I would like to be able load a different sanitizer.cfg file based on the
recipient domain / or virtualdomain configuration.

Within the above script (qfilter-filters.sh), AFAICT there is no ENV
variable that would allow me to logically determine the recipient
domain. There is always a way, but before I invent something, I thought
I'd ask if there is some best practice for using qmail-qfilter in a per
domain configuration. Thx. Eric
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