They're currently working fine, and I've not seen a problem with them for some time now.
I believe I PM'd you about this issue when you raised it a while ago but I don't think you responded.
There are two options in your profile to check:
"Always notify me of replies" and "Notify on new Private Message by Email."
Another thing to check is that the update alerts aren't being swallowed by any spam-trapping you have active - this is sometimes provided as a service by your mail system or ISP, as opposed to something set up on your computer.
If there is such a system, it should be configured to allow incoming mail from [email protected]
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Giraffe: a ruminant with a view.