The delete or tag dilemma

[Quentin Campbell]

We take the view at this site that there is more danger in missing an
important e-mail than in getting spam.

As we have not yet been able to eliminate false positives from our spam
scanning (with SpamAssassin) we simply tag spam at our Mail Hubs and
leave it to users to deal with the tagged messages. Even so a user may
still miss an important message because it was a "false positive" and
was buried amongst genuine spam in the spam folder. 

Are there any sites out there that are automatically deleting spam with
a very high score but delivering as tagged mail spam that falls below
that threshold but is above the "normal" spam threshold (usually 5 to
9)? 

If they are doing this, can they describe how? I recall some discussion
about this on the list but cannot find the message(s) in question.

Thanks

Quentin