slrn: mailing posts for certain newgroups?

Many, many years ago, I remember configuraing slrn so that posts to
certain specific groups were submitted via email instead of being
posted via NNTP.

It looks like I'll need to do that again, but I don't remember how I
did it and can't find any old config files. :/

Can anybody offer any advice on the best way to set that up again?

Create a newsgroup hook that changes post_object to "inews" and sets
"inews_program" to something I hack together that e-mails the article?

--
Grant