I think that extending any of the existent node back-ends (the build-in server, Bob or tiddlyserver) to send an email when a comment is made wouldn't be a terribly difficult task. In my rather limited experience the problem is that most hosting providers block port 25 (or whichever port is used to send email). I think that it would be simple enough to have some convention for putting the tiddler name as the email subject or something similar and probably some date or time information would be enough to uniquely identify a tiddler and allow the recipient to set up email filters.
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