It's very possible that the word "Rape" in rapecage.com is causing email to get caught in a porn filter. Just make sure your security programs have rapecage.com whitelisted.
I've sent emails left and right and even registered a new test user (already deleted) and all forum emails appeared to be working smoothly. They were a bit slow, taking more than a minute sometimes, but I've also got a throttle on how many emails this forum can send per minute. I may take that choker off and see how fast it goes.