What does it mean that someone often sends you greetings?

The first possibility is that in that person's heart, you are very important, so that's why. The second possibility is that that person may like you, so be it. The third possibility is that that person cares about you, so be it. The fourth possibility is that that person respects you, so be it. The above is my answer, which may be inaccurate or incomplete, but I hope it can help you. Of course, if you feel good, you can also use it.