WordPress MU

Hello,

I am running Mu 2.7.1 and will be upgrading to 2.8.4 sometime next week. Email notifications have been flaky since upgrading to 2.7.1. I have the wpPHPMailer plugin installed for my main admin blog, and notifications go out when I:

- create a new blog
- create a new user under blog > edit

Notifications do not work when I change admin emails or when I add a new or existing user from Users > Add new

So I'm wondering if I'm using an uncompatible SMTP plugin.

Thanks a lot for any info.
Moose