Spammers - getting cleverer all the time

I was beginning to think the war on spam was being won. With filtering by ISPs, tools on the desktop and in the email client, a lot less seems to be getting through. But the spammers are getting cleverer; making their emails resemble genuine business emails; spoofing the email 'from' address to add plausibility, and using subject lines that are believable such as 'Re: Your Amazon order 1234567' or similar. These emails contain what looks like a valid web link too. So whether the email is commercial spam or an attempt to infect you with malware, they are trouble. Beware!