I'm using spamassassin on all the domains on my server and it seems to work very well, except for one where it lets through all sorts of rubbish. The emails are definitely being scanned because the headers contain lines like this:
From: Faster Quotes firstname.lastname@example.org
Subject: Make the best use of your money
Date: Tue, 20 Jun 2017 17:15:57 +0100
Are these people just extra clever at getting through or could there be something wrong with the domain/spamassassin setup?