Before starting I must tell you that this is not spamming Training so if you are here to learn spamming you should just leave this page because it is not for You.
Email traffic is usually known as free traffic source. Because you can send Emails to your Subscribers any time you want without paying for ads again. But this traffic source is not completely free as you are paying Email Service Providers to send Emails Each and Every Month.
But there is way to send Unlimited Emails for Free Without paying Monthly fee to Email Service Providers.
No, I am not taking about the free Plans Provided by Other Emails Services Providers. This Something Different.
You can Send Emails for Yourself, your friends and Clients. You can also Create and Scale this to Make Email Marketing business, sell these services to Generate Recurring Income like other Email Service Providers are doing such as Aweber, Mailchimp, and Many More.