I’m receiving empty messages

I’m receiving a lot of empty messages and I don’t know why. I think these are spams but normally, it’s be not possible to send message via CF7 without writing anything…

This is what I just received:

De: “[email protected]
Objet: Association Care Utopia “[your-subject]”
Date: 18 décembre 2021 à 17:27:34 UTC+1

De : [your-name] <[your-email]>
Objet : [your-subject]

Corps du message :
[your-message]