Explained really simply, domain names are just pointers that convert recognizable words or characters to Internet addresses so we can view a website. Whenever a domain name is created, its creation date and expiration date are publicly available.
There are many domain scams out there. A rather common one I often see is where an unscrupulous company tries to overcharge you for your domain name and get control of it.
The main way they do this is by first scaring you into thinking you might lose your domain name because it is expiring. They do this by sending a carefully crafted letter to you through the postal service. The message appears at first glance to resemble an invoice convincing you to renew your domain name with them. These messages are very convincing.
Reading the “invoice” carefully actually reveals it states it is not an invoice – but in fact it is an “offer”. That statement is what keeps it “legal”. Amazingly, some of the companies that trick domain owners like this have been prohibited from operating in Canada after being legally challenged by the Canadian government.
My advice is to always check with your domain provider when presented with anything appearing to be a bill that appears suspicious. It will save you a lot of headaches going forward.