Thus far we built two simple forms on a Joomla 2.5.4 site using Fabrik (updated daily since we have been trying to squash this issue)... We are on a generously sized cloud server and the form submission sits and cranks until a 500 Server error is generated. Apache error logs don't see this as an error. We had the Joomla config set to "SMTP" to get our emails to go through to a "G-Mail" email address... and the emails went through AND the db was updated, but there was no joy on the front end... So mostly because I was out of other ideas for a solution, I switched Joomla to "sendmail", and all is well (email sent to non-GMail account). unfortunately, I MUST use the SMTP... Any idea what is causing the 500 error while the server is set to SMTP?