One big mistake is promoting too many products at once. It confuses your readers and weakens your message. It's better to focus on one offer at a time and explain it clearly. Another mistake is not cleaning your list. Sending emails to inactive or fake addresses hurts your deliverability, meaning your emails might not even land in the inbox. Some people also use misleading subject lines just to get clicks. That can damage trust and lead to more unsubscribes. Not testing your emails is another common problem. Small things like changing your call-to-action or headline can improve your results, but many skip this step. Also, many send the same message to everyone without checking what their audience actually wants. Email marketing works better when you understand who you're talking to. What are some email habits you think people should stop doing?