If you're not getting all of the emails you should, try changing Gmail's filter, forwarding, or spam settings.
1. Start by logging into your original Gmail account, clicking the "gear" icon in the top right and clicking See all settings ...
Overview Gmail sync issues can arise due to poor internet, outdated apps, or settings errors.Clearing the cache, updating the app, and checking account settings ...
Click “Search.” Gmail will display all emails older than your chosen date. Select All → Delete. You’ll see a checkbox above your emails. Click it, then choose “Select all conversations that match this ...