No E-Mail after update to Joomla 3.2.0

-- url of the page with the problem -- : mywebsite.com/mypage
-- HikaShop version -- : x.x.x
-- Joomla version -- : x.x
-- PHP version -- : x.x.x
-- Browser(s) name and version -- : XXXXX x.x.x
-- Error-message(debug-mod must be tuned on) -- : Error_message

Hi,

the E-Mail after finishing the Checkout is not sent with an Error-Message that means something like: This E-Mail is temporarily deaktivated from this website. Please try it again, later. It uses the Textstring: JLIB_MAIL_FUNCTION_OFFLINE
I think it's a Joomla problem, not Hikashop but maybe you know about that. I changed nothing on the server exept this update to Joomla 3.2.0.

Yes, Thank you Jerome. That's it.
For all users with the same problem, simply add the following line to your Joomla configuration file:

public $mailonline = '1';

It should be created after the Joomla 3.2 update but it seems that it doesn't do that in all cases.