My host has recently upgraded SpamAssassin to version 3, and it includes some quite cool new rules which help to combat some of the more recent spammer trends. Here’s some of the new ones I’ve noticed:
- Message body has many words used only once
- Contains an URL listed in the SC SURBL blocklist
- Long string of long words
It’s resulted in some spam getting much higher scores than it used to, which is a good thing. I wish there was an option somewhere that meant that mail over a certain score was automatically deleted – currently mail that has more than 5.6 points is marked as spam but I’d like any mail with over 30 points to be deleted outright because it’s highly unlikely that it won’t be junk. 5.6 gets about 95% of spam but I get the occasional false-positive so I don’t want any mail above that score to be deleted.