Private messaging works great, and it’s a fabulous way to keep your users returning to your site. But if users don’t return to your site they would not know about new messages or replies.
Activate this option to send out an alert for new messages and replies to existing messages, to get your users to return to your site.
Provided in the Extensions Plugin.
Via WPS Pro->Setup->Private Messages, you can set whether to send alerts by email for messages by default (user can switch off). Consider local laws of switching on…