I've seen this problem posted all over without a real resolution. I have four gavickpro templates in use, all hosted at the same hosting company, all within the same account. Two of my sites that (One from The Real Design template and the other from Boutique) are unable to send an article (item) email. When the submit button is clicked in the pop window, the message: "Notice, email could not be sent" appears.
On my two other sites which are the Publisher and Restaurant templates, the email function works fine. The set up in the Global Config is set up identically for each site with the exception of the email address (which works fine).
The resolution posted in other forums suggests editing the contoller.php file in the com_mailto folder and changing the time from <20 to >20. This did not work. Additionally, as a work around, I installed the "Mail this page" module which works fine but it does not use the email button as seen on the article page.
Does anyone have any ideas?