BuddyPress.org

I had this same problem on one of my Bluehost domains. However, I was a little disturbed because I had 2 other Bluehost domains with BP that worked perfectly fine. In fact, one WPMU and one WP install as well. However, the emails wouldn’t deliver. I almost used the mail from plugin, but decided to redirect the MX record for my “broken” domain first.

So, I redirected the MX (mail record) from Bluehost’s crappy email service to Google Apps free (and fantastic) email service. Once I finished redirecting the MX record from Bluehost to Google Apps I tried the registration again on BP and the email went through with no problems.

Just thought I’d offer another solution for those on Bluehost.

Now I’m interested to see if the single WP install with BP will be a resource hog or if it’s just the WPMU that was/is the resource hog on a shared host like Bluehost.