To keep the inbox clean and clear it would be nice to snooze mails for x hours or y days.
Often the inbox is a kind of todo list. So if you can't do the todo right now you can snooze it for later.
Of I you send an importand mail you will keep track of it. So you can snooze the send mail and it will apear in the future, so you can ask about the status or send the demand again.
snozze a mail and move it automaticly back to the inbox after the choosen snozze time has expired
This requires us to store more of the IMAP state locally.
Maybe you could do it the way Microsoft is doing it in Outlook on Android:
If you use the snooze button the first time, you get a popup in which you get asked for defining an imap-folder for snoozed mails. So if your are snoozing mails, they get moved into this folder. And if I understood it correctly, the information until when it reappers inside your inbox is stored locally on your imap client, which is perfect for this usecase, because nextcloud mail is running on a server. The only downside is, that you cannot see this snoozing (or the day when it reappers inside your inbox) inside other imap-clients.
Here is how Kapano solves it.
You can add reminders to mails. This could be shown in the calendar and generate notifications:

Been looking for this since forever. Follow-up, reminder, snooze, whatever it takes. Just make the message go away for _x_ days. As OP says, many (probably most) people treat their inbox as a kind of to-do list. Incidentally, the snooze feature is a crucial part of the Inbox Zero and Getting Things Done methodologies, not to mention just being common sense.
Sorry to pile on without more specific information, but I was ready to post a new issue with what @jakobroehrl said, to the word. Which suggests that there might be latent demand for this feature.
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This requires us to store more of the IMAP state locally.
We have this since #2064
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Been looking for this since forever. Follow-up, reminder, snooze, whatever it takes. Just make the message go away for _x_ days. As OP says, many (probably most) people treat their inbox as a kind of to-do list. Incidentally, the snooze feature is a crucial part of the Inbox Zero and Getting Things Done methodologies, not to mention just being common sense.
Sorry to pile on without more specific information, but I was ready to post a new issue with what @jakobroehrl said, to the word. Which suggests that there might be latent demand for this feature.