Total Posts: 2203
In order to get an idea of what’s happening, try to print the error message you are getting.
For this edit the file app/code/core/Mage/Contacts/controllers/IndexController.php.
Look for this line
and add above it or below it this line:
Mage::getSingleton('customer/session')->addError(Mage::helper('contacts')->__('Unable to submit your request. Please, try again later'));
Then try again to submit the form.
You should get the error message above the form.
Maybe it can help you understand where the error originates from.
If you still don’t have an idea, post the message you get on the forum.