The article provides tips for improving email deliverability and avoiding the spam folder. It emphasizes the importance of sending emails from a subdomain instead of a root domain, as this can help separate reputation issues between marketing and transactional emails. The DMARC protocol is also discussed, which helps protect against email spoofing by verifying that emails are authorized by the sender's domain. Other key points include ensuring URLs in the body of the email match the sending domain, avoiding linked images with mismatched domains, and not using magic links or open tracking for transactional emails. The article also advises against using fake email addresses for testing, instead recommending the use of a testing email address provided by the email service. Additionally, it recommends only sending to those who have explicitly asked to receive emails and avoiding unsubscribers and spam complaints.