Version 2.9.2
It's actually pretty odd. I get my admin emails just fine, including updates from when I post because I have subscribe2 installed. I usually get those right away.
I was doing some work in my forum today and tried to register a new user and the email never made it to the email account. I tried two other accounts, all 3 are yahoo. One got the email, and (so far) the other two have not.
I am at a loss to explain why one yahoo account would get the email just fine, while two others would not. I haven't tested with other email services yet.
edit--I tried an aol account and it received, but went to the spam folder
edit2--MSN live did the same. It got the email right away but it went into the junk folder.