Is it acceptable to post messages like “I am so proud of my students!!” on my school email?

In my experience, the “I am so proud of my students” statements tend to get a lot of attention and there are usually many teachers who post anonymously in the comments saying how inappropriate those posts are. <br><br>I have seen a few messages like this on my school email, so I was wondering what the general opinion is. I personally enjoy reading them and I don’t see anything wrong with them.