I am getting issues where any mail I send through quform are deferred. They appear to be sending OK via the form, but nothing is being received. I have a VPS (recently moved to) and the PHP version is 5.4. I can see the messages in my parallels plesk control panel mail que. Can you suggest anything? I’ve contacted 1&1 with whom the VPS is hosted but they don’t seem to be able to help at the moment.