OK there is nothing wrong with the received email advices that a client has sent to query ESTIMATE/INVOICE except that the “subject line” in such emails would suggest that there is a new client with a message rather than a client has sent a new message.
I would prefer to receive such emails that make sense as presently such emails suggest that a NEW client is in touch!
A more understandable subject line is by removing “new” so such emails have subject line “You have received a client message” which would avoid the implied suggestion that the email is from a new client.
The semantic disagreement is better and simply fixed by the removal of “new” from such emails