Organizing your inbox becomes difficult when you use the same address for everything: sign-ups, orders, support messages and newsletters.
Plus addressing, also called subaddressing, is a useful way to keep everything under control without creating new accounts or aliases.
Plus addressing lets you add a “+label” to your main address so you can manage every flow of messages more clearly.
Here is an example.
In the Qboxmail Webmail you can create a rule that moves any message sent to an address containing +socialnetwork into the “Social” folder you created earlier.
Plus addressing is useful for:

Plus addressing also helps protect your privacy.
By using different variants of the same address, you can monitor who shares your data and reduce the risk of spam or unwanted tracking.
If a specific address starts receiving unwanted messages, you can block it or filter it without touching the main account.
Plus addressing is supported by most providers and does not require activation.
It is a simple way to organize your email and keep control of your inbox, especially if you manage many messages every day.