The forum has search (and it's not necessary to register to use it -- or to view any found messages).
That's for issues where me or one of the "certified AquaMail experts" was able to post a solution.
On the other hand, sometimes I have to ask for a debug log -- and then the outcome varies. May end up being a bug in Aqua, or unreasonable / wrong settings, or a bug somewhere else (mail server, device's software, etc).
And then sometimes people post questions / issues here, and never respond to my request(s) for more info.
So it's not a clear "question / solution" pattern every time. I never delete any old messages from the forum, though, except spam.