You can improve the open rates of your cold email by focusing on the subject line. The subject line should grab attention quickly. You should personalize your emails with the recipient's name or company. A clear and concise message works best. You should avoid using spammy words in your email. Your timing should match the recipient's schedule. A professional email address builds trust. You must ensure your email is mobile-friendly. The preview text should complement the subject line. You should test different subject lines to see what works. Regularly update and clean your email list for better results.