Ralph Paglia shares best practices for auto dealers to get their email marketing past spam filters based on Courtesy Chevrolet's success. Key points: 1. Understand filtering rules of major ISPs like AOL, MSN, Yahoo and avoid trigger words like "free" or "discount". 2. Maintain good relations with ISPs and avoid blacklisting by checking status on sites like openrbl.org. 3. Test emails by seeding to major ISPs to ensure deliverability and compliance with CAN-SPAM regulations.