Nextmail is like a fancy way of sending and receiving messages on the internet. It's kind of like sending a letter through the mail, but much faster and easier.
Normally when you send an email, it goes to a place called a server where it waits until the person you sent it to opens their email and downloads it. With Nextmail, the message goes straight to the person's device almost instantly.
Nextmail has some special features that make it different from regular email. You can see when the person you're messaging has read your message, and you can prioritize your messages so that important ones come first.
Overall, Nextmail is just a cooler and more efficient way to talk to people online.