I've been searching around, and I can't find anything relavent.
I'm new to sendmail language, and run a small family webserver/mailserver.

I wish to implement and per-user blacklist, that is if UserA says he
doesn't want to recieve mail from address spam@spam.com or domain
spam.com, I don't want his blacklist to block mails going to UserB.

Orginally, I had just been adding to access map, but that affects
everybody. One family member has blacklisted monster.com because he's
sick of getting emails from them, an another brother has complained his
email from monster bounced. Glad it wasn't a job offer!

In general, this server doesn't recieve much spam, and I don't want the
hassle of 40 hours of reading to implement a full-scale spam solution,
I'm prettysure sendmail can do what I want it to with the rulesets, but
my attempts thus far have been futile.

Can anybody point me in the right direction here?

Thanks for any advice you can give me.