I'm very fond of Dreamhost -- but I'm nostalgic for Open Webmail, the webmail interface my old provider had. Why? Because Open Webmail would allow me to create custom filters based on headers, and I could circumvent 99.9% of my spam with a couple of rules updates every week based on "spam trends." Right now, for instance, there's a spate of spam that I could easily block -- probably sixteen to twenty messages per day -- that get past the default squirrelmail filter and "spamassassin."
Frankly, blacklisting addresses is totally useless.
Is there any way to add more options to squirrelmail or beef it up somehow? It's not critical, but it would go a long way towards eliminating some recurring annoyances.