As a Salesmsg user I'd like to see any message that has not received a manual response from me - whether it's been read or unread, to show up in the Needs Response filter.

Currently, it has to be the first message received from a Contact, and if it's not the first message, it has to be read first.

This will help me come back to any messages I've read, or haven't read, and still need to reply to.