Plus addressing is about using unique, receive-only email addresses that are kind of extensions to your basic email address. It helps you keep your inbox tidy and protect it against influx of unwanted messages. You can create new plus addresses by adding a new tag to your BlueKey email address. You can use a plus address as a unique address for a service that you sign up for.
Although this new feature with BlueM@il and Outlook may be difficult to initially understand, it's a pretty straightforward and useful feature once you get the hang of it.
Say you're visiting a website and you are asked to join a newsletter. Instead of providing your firstname.lastname@example.org email address, add a tag like "email@example.com". All messages will still go to your normal inbox, but you now have the option to create a rule where any firstname.lastname@example.org goes to a folder called "Newsletters."
If you are signing up for a new newsletter on another website, you can use the email address of email@example.com. When messages are sent from that newsletter it will look like this and be delivered to your Inbox:
Since the email from newsletters contains the Plus Addressing tag (not just your normal email address), you to create inbox rules specific for those messages. In the case of the newsletter you can create a rule that takes all messages sent to firstname.lastname@example.org and moves them into a folder called Newsletters.
Obviously, there are countless options for the Plus Addressing feature. Filter by any tag or term you would like. Create folders and rules to automatically filter emails with corresponding Plus Addresses.