Hi,
Just experienced a couple of bugs with this module which happen when the save messages setting is off.
SimpleContactForm.module
First bug:
if (!$this->pages->findOne('name=' . $this->pageName) instanceof Pages) {
I believe this should be without the "!" at the start as it is currently the wrong way around. Removing it fixed it for me.
Next bug:
} elseif (!in_array($currentIp, $excludeIps)) {
This line should also check if the saveMessages setting is on, i.e.:
} elseif (!in_array($currentIp, $excludeIps) && $this->saveMessages) {
I haven't tested any of these with other settings and I'm not sure they are correct - just needs some looking into.