It looks like this under general settings...
Private Messaging:
Private Messaging on
Private Messaging off
This forum features a private messaging system, which allows members to send messages to one another privately.
If you do not want to send or receive private messages, you may disable the private messaging system.
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.
Email Notification of New Private Messages:
Receive Email Notification of new Private Messages
Don't receive Email Notification of new Private Messages
The forum can send a message to your email address to inform you when someone sends you a private message.
New Private Message Notification Pop-up:
Show New Private Message Notification Pop-up
Don't show New Private Message Notification Pop-upIf you are browsing the forums when you receive a new private message, the system can pop-up a notification box informing you of the new message.
Sent Private Messages:
Save a copy of sent messages in my Sent Items folder by default
Don't save a copy of sent messages
When sending private messages the forum can make a copy of the message in your Sent Items folder.
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Visitor Messaging