Messaging Free Members
Our non-paying members do receive notification of new messages received, and often when they see interest being shown towards them, they subscribe so they can read and respond to those messages. We also offer free trials on a regular basis so non-paying members can read and send replies to their messages for a brief period of time.
Although our paying vs. non-paying members are not differentiated on the site, we do offer a premium service called "Email Read Notification," which allows paid members to see who has opened and read the messages they've sent. Members who are not active subscribers will only appear to receive messages, but they will always show the status of "unread" to the sender.