G'day, skyhawk85u, and welcome to
Kunena.
As you can see, this topic was started over 3 years ago as a kind of "is it possible to do this" thing. As you also know, there is not feature currently in
Kunena that allows you to do this kind of thing easily. This topic canvasses a lot of different opinions and ideas about how you might go about having all the members of your community "automagically" subscribed to receive email every time someone posts a message in any category in your forum. There are different opinions about whether such a feature is desirable because of the possibility that, in a very busy forum, people would be bombarded with email.
Yes, there are ways that you can tweak the SQL but we have to be very careful when we start dabbling in things we're not very familiar with (see
How To Destroy your forum data...).
As you also know, this is a community-driven self-help resource. If there's something that people want to do that's not provided within the standard feature set, then we will do our best to try to help but the
Kunena project makes no guarantees that it can help or can continue to guarantee that certain ideas relating to one version of
Kunena will apply in a later version of
Kunena.
For those people who
can make the changes that they need to make, that's good. For those people who can
not make the changes that they want to make, what would you like the community to do to help you? Perhaps you may consider using the category
Requests for help - offering to pay if the requirement is necessary and urgent. If the requirement is desirable or not-urgent - in other words, you may have to prepare yourself for a long wait for a
possible solution - then use the category
Requests for help - not offering to pay
I hope some of these thoughts give you a bit of guidance about what you may consider doing next.