All your emails fit into one of the following 6 categories:
- Respond today: reply immediately if urgent, at the end of the workday if important
- Respond later: schedule time in the calendar in the future to reply
- Optional response: no need to respond, but it would be nice of you to
- Not important and no need to reply: archive or delete
- Read later: file into a specific folder and read in your spare time (e.g. newsletters and reports)
- Filling: file into a specific folder (e.g. purchase receipts, copies of important documents, travel arrangements).