If you aren't getting emails from the forums or wiki you aren't crazy. This may also be causing some problems with new sign-ups since you may or may not get the activation email.
The problem is that the reverse DNS entry for smtp.osdev.org has gone missing and many mail servers around the world will think my server's emails are spam and either refuse them or place them in your spam folder. I've got a trouble ticket pending with my hosting company to figure out what the problem is.
Forum/Wiki Emails
Re: Forum/Wiki Emails
Reverse DNS is now working. Forum emails (registration and reply notices) should make it though to you if they weren't already. I re-sent email activation notices to any accounts that people have tried to create since July just in case.