It's not enough to use the most eye-catching email template, or pay a relative small fortune to a designer every time you need to inform your users of a new feature, sale or service availability. You need to use psychology to ensure that users will go through the email's content once they have it opened. Your success has little to do with luck: there are laws, and you should know them in advance. "UX design and psychology are closely tied, despite this connection is not always obvious to users."