To ensure the success of your email marketing, it's important to follow best practices such as email delivery and email deliverability, segmenting your email list, personalizing your emails, creating engaging subject lines, using a clean and visually appealing design, and testing and analyzing your campaigns & flows. Additionally, make sure that you are compliant with email marketing regulations, such as the CAN-SPAM Act, GDPR and that you are sending emails to recipients who have given you permission to do so.