The mail function has been temporarily disabled on this site
After upgrade to Joomla 3.2 from previous Joomla 3.* versions you might see the above error message in the backend, or, worse, you simply don't receive any e-mail notifications you usually do. And the site worked just fine before the upgrade!!
If you have registration enabled, or you use the site to interact with your visitors/customers the side effects can be really damaging - nobody gets any mails - and you evend don't see any notice about, until you began to dig for the causes, and, for example, try to send a message for yourself from backend. This potentially can roun your online business or community. Apparently everything is OK, all settings are correct, but the mails are simply not sent.
What's the cause and, more important, how you can fix it?