One question... with other forums if TEN people post in a thread you only get ONE email until you visit the forum, not a new one for each post. I think that makes a lot of sense.
How does this system work?
Nabble doesn't save the date of the last visit in the database. So we can't implement a mechanism like that and therefore must send one email per message posted. This shouldn't be a problem because emails thread under the same topic, so the inbox is kept organized.