Distinguish user-selected solutions from ST-selected solutions.
I’ve had 3 “marked as best answer” notifications this morning:

They are all old threads:
Last activity 2 months ago;
Last activity 2 months ago;
Last activity 1 month ago.
So this looks like ST tidying-up abandoned threads - rather than the users returning to mark solutions?
As previously mentioned, this is fine - but I think it should be made clear when ST has done this, rather than the OP.
The old forum did, at least, include this in the notification;
PS:
Just had a fourth:

Again, an abandoned thread - last activity a month ago:
