Switching "Private Message" System Off

Hello,

I would like to turn off and hide the private message system for all listings.

In Theme Options — General Settings — My Account Page I have truned “Private Message” off but on the listing page it is still visible, i.e people can write messages to the listing owner.

So, I would like for people not to be able to write to the listing owner via the private message system.

Background info: as in these last months my site has been very heavily attacked, I had to change the standard login URL and hide completely the “back end”. With the private message system on, listing owners are not able any more to login to reply to messages they get, this is why I would like to get completely rid off of the private message system. (Using the latest Responsive DP with the latest WP version.)

Thankx!
Attila