Plus addressing is a feature that allows you to automatically filter incoming emails into folders without pre-creating the folders or filters to deal with them.
Plus addressing also allows users to use special email addresses if they do not want to give out their real email address. For example, if firstname.lastname@example.org needs to provide a valid email address to sign up for a newsletter, he can sign up for the newsletter using the address email@example.com. When the newsletter is delivered, it will automatically be routed to the Technewsletter folder. If the folder does not exist, it will be created automatically.
Follow these steps to enable plus addressing: