Just a quick pen-down to give this more Google visibility. Here’s what you can try if your N9’s default email client stopped working.
- No new mail, ever
- Telling it to sync/refresh takes forever, and nothing gets done
- Emails don’t get sent out, takes forever and nothing happens
- Removing and re-adding the mail account doesn’t help
Long story short, your QMF database (presumably the database used to store mail data) may be corrupted. Fortunately, fixing is easy:
- delete the database – Use your terminal app to run this:
rm -rf /home/user/.qmf
- then reboot your phone.
The client will simply refetch your mails and rebuild the database, and the world is sunny again.