Their solution involves hooking a perl script into mail delivery for sendmail and postfix.
Now, I have nothing against that method in general, but if you need to send so many emails that it's useful to use the Amazon service, then forking, starting up perl and then running that script for every email you are sending might not be a viable option performance-wise.
On the other hand: If you are using amazon's service for sending mail, then with some likelyhood you are also running EC2 where wasting a couple of CPU cycles is beneficial for Amazon :-)
You can configure SES to work with Postfix or Sendmail. It's at least close to what you're asking about.