You can change your email address and it will ask you to verify the email by clicking the verification link in the email that is sent to your new address. If you post before verifying your account your new posts will not be displayed until verified. I am not sure why your email would be sending the messages directly to the spam folder, that would be down to your email client. I personally use gmail as the emails go directly into the 'social' tab in my inbox.
Let me know if I can help you with anything at all.