[Matth]

Well, I'd be happy if they implemented pure DUL blocking - 99% of spam comes that way, and any legitimate mailers have to be prepared to work with the DUL provider in question.

Freeserve/Wanadoo use spamtagging (optional spamdumping selected in web interface).
Their tagging is generally too aggressive, leaving, for instance, Serif's special offer mailings spamtagged.

My workaround (and I know there are flaws), is that I peeled all the previous spamtagged mail to a folder, examined it and noted all the "friendly" addresses, then built an OE rule that discarded anything spamtagged that was not from a "friendly" address - it would be better if they used the web interface address book for spamtag opt-out.