I think this is actually a feature of the forum. But I also think the explanation of the feature has been (accidentally??) dropped from the mail template.
Earlier messages contained this text:
Quote:
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There may also be other replies, but you will not receive any more notifications until you visit the forum again
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So, you'll get an alert on the first, but not on subsequent posts, until you visit this site again. I assume this is done to minimze outgoing (and incoming) e-mail.
Cheers,
Imar