Ok this is probably as vague as it comes but a client's site has contact form 7 and it's not working. He had his email in the settings correct and I tried submitting a test to him. The form worked properly, said message was sent. Nothing received. I changed the email address to my own in the settings to see if his email system is the culprit. It's been ten minutes now and I have not received any email.
I'm running the latest version with the latest version of wordpress.