Sometimes people forget or simply give up on getting an answer for something asked a while back. Maybe I got the answer by myself and forgot to provide it to the community.
X days after the last answer received in a post I started that has not a "Mark as Solution", I should receive a reminder to:
- pick a solution;
- give more information;
- mark as no longer needed.
It's not a big deal. Support sends very frequent mails asking for inputs.
My suggestion is one 1 month after and a second 3 months after. They can even be grouped in a single email (on the 1st of March a summary of January pending questions).
(And a date filter so you don't bomb everyone with 300 emails related to 10-year-old posts)