Get reminders for specifically marked e-mails (e.g. I send an e-mail and would like to be reminded on a specific date if I did not get a reply yet)

I do send out e-mails where I need to wait for an answer. I move those e-mails into specific folders, but since there are a lot of e-mails I would like to get a reminder that I did not receive an answer yet. I think about something like: I mark the specific e-Mail and set a date when I would like to be reminded. The reminder can either by an automated e-Mail or in a window where I can see all marked e-mails no matter in which folder they are. Is this possible? Or is there an other option that would work?

Thank you for your help!