I've read that establishing an email list is one of the most important things to do if you want to have a successful marketing campaign. But I have long wondered how I could collect emails. They say that a good landing page should be made. But what if I just have a regular blog that talks about business and stuff. Do I still need to create a landing page in order to get emails? Is there an easy way to do this in a WordPress site? All my websites are made using WordPress. Also, is there an effective way to gather emails without using a landing page? Is there a proper plugin for that?