Hi Don,
We will get to the bottom of this, one way or another!
I just sent you a test message from our server-- please let me know in this thread if you receive it.
I looked through our logs and see where our email server has sent you a few messages over the last 8 weeks, and I don't have any bounced messages from your mail server. I do see that you are subscribed to 3 threads that have been updated since June 1, so in the best case, the server has sent you three notifications. I also see that you have daily digests turned on for a few of the forums.
I tested the instant email notification in the test thread in this forum and it seems to be working. Please subscribe to this thread (here) and we will continue to test until the issue is narrowed down.
Thanks!