A method of processing a message in a messaging service client device that has a user interface device includes with the messaging service client device, ascertaining a proposed recipient for a message entered by a user with the user interface device; determining a set of potential recipients for the message with the messaging service client device, the set of potential recipients including the proposed recipient; determining whether, among the set of potential recipients, the proposed recipient is a most likely recipient of the message; and responsive to a determination that the proposed recipient is not the most likely recipient, providing a notification to the user through the user interface device that the proposed recipient is not the most likely recipient.