Major ISPs Publish Anti-Spam Best Practices
wayne writes "The ASTA, an alliance of major ISPs, has just published a set of best practices to help fight spam. The list of ISPs include the likes of AOL, Yahoo, MSN/Hotmail, Earthlink and Comcast. The recommendations include such things as limiting port 25 use, rate limiting email, closing redirectors and open relays, and detecting zombies. For details, see the ASTA Statement of Intent (pdf) or any of the ISP's antispam websites."
Security through obscurity is not the way to go if you ask me ...