A friend of mine just sent me a text and said he sent me a private message on RP and I didn't respond. My personal settings is set to where only Contacts on my list and a Moderator can send me a private message. If anyone else does then I will never get the message. I set it up this way a few years back to eliminate folks that I don't know asking for information, etc. You can also set your PM to receive messages from everyone. Just wanted to let everyone know the two options. See below:
Receive Private Messaging:
Only from Contacts and Moderators
From all members
You may limit the receipt of private messages to just moderators and your contacts. Other members who attempt to send messages to you will be told that you have disabled private messaging.