Mike Lyle writes

OE allows killfiling, which is pretty well essential for a group like
URG which is under constant attack from trolls and egos. A better reader
also allows you to killfile not just individuals but whole crossposted
groups:

Turnpike has built in rules to kill article (can't see the point), whole
threads, particular subjects or particular posters, and you can create
customised rules, for example to kill posts that are crossposted to more
than a certain number of groups, or which are more than a particular
length (eg 200 lines)
--
Kay