Hello! I am a non paying member at this time so I can only share with you what my experience has been.
I receive an email when a member contacts me telling me that I have a message. I have to come to my bandmix account to check the message.
I can then respond to that message, but I can not go to your profile and send one.
I am not sure if there is a way to tell if your message was received or has been read. I assume that a bandmix member reads and typically responds to these, but I happened to be cruising through and thought I might be able to help.
Your pic is adorable by the way!
Hope I helped somewhat.