That plugin will spam your list !

No, it will not. You have a specific problem that others don’t have – nearly 10,000 users have installed it.
Please stop flooding the forum and spitting on my hard work. The plugin is free, if you don’t like it, don’t use it.

The comment “// run only once per day” just explains the code below it. The code below it ensures that the hook runs only once per day no matter how often the script is accessed.

I don’t know why I am spending my time to explain this. (This explanation was about a comment the OP made. Later he edited his comment).

I am sorry if the plugin doesn’t work well for you. Just don’t use it. Wish you all the best and good luck finding a better one.