Gmail recently introduced two new Smart Filters, Notifications and Bulk which declutters your inbox from email that usually comes from Forums, Backup Notifications, Twitter Follower notifications, Promotional emails etc.Though on one hand this helps a lot but if you don’t often check these labels, it is likely that you might miss out some important emails which I did the last week.
One way to fix this is regularly check them for couple of days and make theme even smarter by removing emails from there so it comes to your inbox but if you aren’t ready for any surprises you can either delete them or disable them completely.
To disable Smart Label Completely :
Go to Mail Settings > Labs and search for Smart Labels. Select the disable radio button and you are done.
How to Disable some of the smart labels :
Go to your Mail Settings > Filters and delete the filters named as Forums, Bulk, Notifications and Promotions. Done this your next step is remove the labels also which is applied to the emails by these filters. Switch to Labels Tab and remove the same. Remember Gmail will only remove labels from those emails and will not delete it.
Your next obvious step is to type “is:unread” in the search box and find if you missed any of the emails.
I am not sure but since I removed the labels and filters manually instead of disabling, I did not get back the filters even when I re enabled it. So just make sure you remove what you do not need.