[Mimedefang] Drop spam for one domain only?

[Gordon Henderson]

I handle email for several domains, some pop boxes, some collected via
ETRN. One of of the punters wants me to delete all email to them that has
an X-Spam-Score of above a certain value, but I'm not 100% sure how to go
about doing this .. I'm guessing in filter_end () after it's fed through
SpamAssassin but my perl isn't up to extracting the domain the current
email is going to... Any pointed would be appreciated!

Thanks,

Gordon