Currently it is:
“Send for a servant to Privately deliver a message in the morning.”
At least for me, intuitively this means A: I do not visit the target during the night (a nameless servant does and the message gets delivered in the morning); and B:They do not know who I am.B is true, A is not - it still shows as me visiting the person who I gave the message.
A better description (in my opinion) would be:
“Slip a private message under someone’s door. They will find it in the morning.”
Because it implies that you are visiting the target.