This is just a reminder for people who may not be getting all of their emails. If you have already checked your spam and deleted items folder you may want to check your “Clutter” folder.
Clutter looks at what you've done in the past to determine the messages you're most likely to ignore. It then puts them in the Clutter folder. Just keep using email as usual and Clutter will learn which messages aren't important to you. From time to time, Clutter might get it wrong. You can move the messages we've incorrectly identified as clutter to your inbox, and Clutter will take notice.
All you need to do is move the emails you want to keep to your inbox and Clutter will stop putting them there automatically.
The other option is to disable clutter and all your emails will go to your inbox. The instructions to do that are here